Seager Engineering

Seager Engineering Please WhatsApp your enquiry on 07880602012 between 9am and 5pm Monday to Friday so we can reply at our convenience...thank you
Pat & Jim

Seager Engineering provide machining services to classic vehicle owners, local motor-trade and industrial/marine companies. A comprehensive range of specialist engine reconditioning machine tools allows us to provide repairs and standard recon to a very high standard plus complex casting repairs. Services include:• Re-boring and re-sleeving of cylinder blocks and motorcycle barrels
• Crank grindin

g up to 60” in length
• Cylinder head/block facing with PCD/CBN tooling
• Valve seat work including lead free inserts
• Various crankshaft repairs
• Aluminium and cast iron welding
• Thread repairs by helicoiling, timesert or custom made
• Bearing housing re-sleeved to original postion and size
• Component supply for all modern leading brand engines
We supply spares for vintage and classic machines and manufacture our own for specialist applications. We also supply modern and classics motorcycle engine parts. Contact us for more details or go to our online shop. We have over the years provided industrial component reconditioning at both repair and re-manufactured level. We can work with companies to provide a remanufactured part on an exchange basis so lead times can be reduced including manufacturing the spares required in small batch quantities. Component material can be analysed to determine the type and quality so parts can be replicated or improved as required. Typical components are shafts, bronze bearings, pumps, both water and fuel injection pumps. Contact us for more details

We can offer prototyping machining services
either from scratch using a sketch, drawing
or altered from another part. Using all our machines we can machine and alter most
components and with our extensive experience and large
engineering contacts most things can be 'schemed' or
adapted/utilised from commercially available components. We can accept electronic files with drawings such as .iges or .dwg - email us for more information. Blasting your component to an 'as new' condition. Whether your component is fragile or robust we can can give a brilliant sheen finish to either ferrous or non-ferrous parts. This versatile process can give both a decorative finish, clean state and can be economically produced on a wide variety of used and new components. Ultrasonic Cleaning
Effortlessly cleans places you just can't reach. Ultrasonic Cleaning is regarded as a way of cleaning components which either have complex drillings or difficult to reach places. Using soundwaves to cavitate air bubbles in the cleaning fluid, you can clean delicate and complex assemblies effortlessly with virtually no component risk. Ultrasonic Cleaning
From carburettor's to cameras, crankshafts to clock parts, using a wide variety of fluids and temperatures and by adjusting the frequency great results can be achieved. We now have a BLASTWASH BTW1350 and a VIXEN JETWASH 600 Aqueous Hot Wash which is loaded with an applied chemical caustic degreaser which is made intentionally for aluminium. This cleans carbonised oil and dirt to a bright alloy finish. Stubborn dirt does need agitation but 80% cleaning is achieved within 10-20m cycle times. It is primarily used as part of the engine reconditioning process, we keep it regularly maintained and also use it for cleaning components and tools etc...

Many materials such as copper, brass, steel and cast iron can be accurately machined and silver soldered together for a stong and reliable joint, eliminating leaks of air/fuel or hydraulic pressure. SOFT SOLDERING: This process is mainly for small items where heat and distortion are to be kept to a minimum, examples include carbureter parts, decorative brass components, fuel or water pipes. SILVER SOLDERING: This process is highly underrated and if performed correctly provides an incredibly strong joint. Strict clenliness and joint preparation are essential but many items can be almost invisibly joined. broken/cracked cast iron is one material that responds well to this type of repair. BRAZING: Used for manufacture and provides an on-surface joint of reasonable strength many components are made by joining parts together and can be repaired by un-fusing, manufacturing a new section and re-joining. Our MUREX 375 SQUARE WAVE TIG WELDER allows us to weld aluminium castings or fabrications as well as stainless steel, aluminium/phosphor or bronze either in manufacture or repair. Other applications include stellite hard facing on rockers and other hard wearing parts, please contact for details. It also has a stick welding facility for cast iron, mild steel and stainless. With adjustable foot control for the amps and a fully adjustable current setting all materials can be welded. Seager Engineering has a wide experience in aluminium castings for classic bikes and cars as well modern cylinder heads. Components regulary repaired include: Crank-cases, cylinder-heads, gearbox casings, fuel pumps, bronze selector forks, fuel tanks and marine stainless steel fabrications. Hard facing using stellite is a cost effective way of reclaiming work wear pads and followers, we also have grinding facilities to re-surface back to original. Stick Welding
We can repair small cast iron parts with ease, but larger cast iron components require a more specialist approach and are best discussed on application. Please forward details for more information. On-site welding and fabrications can be arranged through one of our engineering partners. Services include hard facing, structural welding and fitting. MIG Welding
Our MIG welding capacity is mainly aimed at small fabrications and repairs but we can offer larger fabrications and on-site welding thru one of our engineering partners. Please contact us for details.

T140 alternator keyway repair.. I used a copper silicon bronze Tig rod to carefully build up the shaft and then remachin...
12/06/2026

T140 alternator keyway repair..
I used a copper silicon bronze Tig rod to carefully build up the shaft and then remachine back to standard.. hard enough to work yet no distortion.
The main bearing housing was machined out and thread milled and a new housing turned on the lathe and fitted.. it had a longer end on the primary side so we could drive it in and loctited and torqued up FT then machined to the original length.. giving it the look it has now..
It was then flipped over and machined to concentric with the registration diameter.. the original housing was badly welded and off centre.. the high gear seal housing was damaged by a chain break and welded and machined..
The crank had the full works.. so it’s now as good as it can be ready to be built by the customer.

Next week Vincent cases getting loads of TLC😃😃😃

12/06/2026

T140 with a smashed mains housing full repaired .. crank over hauled and keyway repaired and a few casing repairs

12/06/2026

T140 main bearing housing repair and crankshaft alternator keyway repair plus a few other repairs and new bearings

Triumph TR6 1967, we have just finished this rebuild.. we have another to do next, ( yes you PD) But this one had most s...
12/06/2026

Triumph TR6 1967, we have just finished this rebuild.. we have another to do next, ( yes you PD)
But this one had most stuff in it including steel conrods and all the bearings .. infact a complete restoration.. lots of clutch parts/primary drive and a layshaft and top gear… countless thread repairs screws fixings, cams, followers and tappet blocks.. I went for the 1.125” radius followers … ditched the oil metering valve and gauze and fitted the later small flat followers .. I also fitted the nitrided half race exhaust cam..
Full no expense spared job on the head , checked over the rocker box’s Aqua blasted every thing… that was the first job.. cerakote barrels, rebore and pistons… the list goes on.. very little is left of the original internals but it came back from the states and it had had a hard life… but just wear and tear not buggered up as such.
Again these builds soak up the hours and frankly are too time consuming to command a good hourly rate..
but this one I stopped the bill at £6 k
But I spent more time and replaced more stuff FOC …
Not good business and means that not enough overheads are reclaimed so I have to do more to make it work..
It’s no good and it’s put us in this backlog situation.. so we will have to try and account for all the hours and be more realistic.. no good trying to save everything and everyone if it doesn’t really wash’s it’s own face and make a profit..
with out another good pair of hands we are faced with this problem and have no choice but to charge for all the hours and market value on the parts😃😃😃

Otherwise Stacking shelves at Tescos will be more attractive 😳😳😳😳😳

This is another set of early 1978 ish Ducati  900 bevel heads.. these are almost certainly not off the same factory bike...
02/06/2026

This is another set of early 1978 ish Ducati 900 bevel heads.. these are almost certainly not off the same factory bike .. the intervening 50 years has seen this bike having various repairs..and replacements

I’ve seen some dodgy seat installations before and various methods of removing but these had previously the seats drilled on the edge to sort off cut them in half…WTF and left cuts and divers in the counter bore… out with the TIG welder .. the seats had been replaced several times before and were humongous… so we made new ones out of CA104 wrought aluminium bronze.
These were turned here out of solid along with our colsibro valve guides ..
we also did our exhaust thread repair using our bronze nuts .. totally unique to us…
Then the head faces were cleaned up.. and the chambers plus timeserts in the plug holes..

I can honestly say this write up doesn’t even begin to explain the amount of hours that have been spent over the last two years to produce these Ducati repairs…… from concept to 3D scanning the original nut to 3D print a model allowing for shrinkage and machining, inc lost wax casting the bronze nuts,from designing fixtures and making them to buying materials and machining parts to obtaining all relevant dimensions.. and the relevant tooling!!!
Then advertising it and making it happen and still make a profit…
I did this because these bikes are younger and will help future proof this business… hopefully before the politicians f**k it all up!!!

But the jist of all this is
“ you can only p**s with the c**k you’ve got” meaning we have to make the best of everything we can!

Suzuki T250 barrels which have our stainless steel exhaust thread repair .This is a very easy job as we have the inserts...
02/06/2026

Suzuki T250 barrels which have our stainless steel exhaust thread repair .
This is a very easy job as we have the inserts in stock… all the jobs we do which appear regularly are easy..because we have fixtures and spares already in stock..
Thank god there are easy jobs because if there wasn’t it like swimming against the tide with nowhere to “haul out” and catch the tide the next day..

Jim pockets the head completely removing the knackered exhaust stub and helically interpolate a new 1.00 pitch thread and fit the insert .. the insert and the pocket are accurately machined so the bottom of the insert and the shoulder of the insert bottom out at the same time.. loctited in and with a special installation tool pulled up FT and cured in the hot tank… finished off with a flex hone .. the barrels are ready to go back on..
Another job off the list but we are still restricting our incoming jobs till we’re ready 😃😃😃😃

Ducati 900 bevel drive head…This is one of our first fully engineered by ourselves exhaust thread repair inc our replica...
02/06/2026

Ducati 900 bevel drive head…
This is one of our first fully engineered by ourselves exhaust thread repair inc our replica bronze exhaust nut.
This head although not the exact first one we have done it was the first with previous repair that had failed..
Like so many Nortons it had a parallel aluminium insert that had only the top welded and had due to heat turned to a toffee like material and stripped.. the aluminium insert expands and when it cools shrinks away from the head, this makes the insert overheat even more due to the fact it’s no longer in contact with the relatively cool head and absorbs more heat from the exhaust.. it eventually fails..
I had to weld this one up because the guy who did the last repair bored out the head so big our insert was like a prick in a top hat…NFG…
But after welding Jim helical interpolated a new thread to fit our insert and then coincidentally machined the new thread for our very own Cnc made nuts.. these are cast especially for us and are a perfect replica..
Seats cut and the tiniest skim of the head gasket face to ensure a gas tight seal …. There is NO head gasket.

Apologies for those who are still waiting.. we are ploughing through our backlog and I’m ashamed to say it’s still long.. but please accept that not all our work is quick and straightforward and we are chronically understaffed..
Don’t think I haven’t tried to alter this but it’s a more difficult problem to solve than most people think..
I am still not accepting projects till we are more upto date

More stuff to come please keep looking… 😃😃😃

30/05/2026
Norton 750 atlas … it’s an upright 750 commando really but used a 6306 ball race on the timing side..Like the early “ co...
27/05/2026

Norton 750 atlas
… it’s an upright 750 commando really but used a 6306 ball race on the timing side..
Like the early “ combat” commandos that the main bearings failed..
They failed because the crank flex “jammed” the rollers on the drive side and made them skid instead of rolling.
Now all crankshafts flex… not just in Norton commandos, but three piece Triumph cranks and one piece Triumphs too…. That’s why eventually they crack and break… but for the same reasons you need C3 fit bearings in Triumphs… C3 is the loosest radial clearance to allow for a bit of movement but still roll…. All Japanese cranks that run on bearings like Yamaha TZR 250 even though they have 4 main bearings and are all C3 fit still flex and often have fretted the cases so the bearings are loose…. The 4 stroke Japanese singles can do the same… only sturdy well supported shell bearing cranks turn all the piston pressure into torque… and not bend the crank.Engines now have larger mains but narrower and bigger ends but narrower and 5 mains for 4 cylinders… producing a short engine which can easily fit transverse in a car… modern bikes are the same..
Infact the Triumph TSS 750 increased its big end diameter and narrowed the rods again to stiffen and strengthen the crank.
However this Norton was changed like most of Nortons big twins to a twin roller superblend FAG bearing supplied by Andover Norton.. these have a increased radial clearance with slightly barreled rollers and should be set up with 0.010”-0.024” endfloat to allow for the crankshaft to “grow” width ways as the revs and horsepower increase.
This one had fretted the casings and we fitted tolerance rings to maintain the bearings in a well supported continuous grip.. they require a press to fit the outer sand slide in on a 1/2 ton arbour press with medium pressure feeling reassuringly firm yet not over tight. You can vary the fit by decreasing or increasing the diameter of the housing and there is a convenient table that lists sizes to torque figures that can be achieved with recommended fits for applications.. truth is these tolerance rings will provide constant grip on the bearing and allow the crank to flex and still remain fully supported unlike the original housings.
We also stripped and fully cleaned the crank, ground the ends ,fitted new crank bolts, supplied new steel rods… honed the bores, supplied new rings, New big end shells, set up the end float to 0.018”and Dynamic balanced the crank..supplied a new chilled cast iron camshaft and refaced the followers..
Yesterday was bloody hot and exhausting so I went to sizewell and then onto Aldeburgh for my supper and cooled down and relaxed overlooking the sea on the dirty wall next to the Martello tower.. a redundant bit of defence architecture from the early 19th century built to defend against a Napoleonic invasion😳😳😳 ironic really 😳😳😳
In the tranquility I wrote this ….
Only to come in today and Jacob my saluki has been sick and we have developed a loud and worrying squeak on the Cnc spindle..
Coupled with the current situation looks like the heat is getting to everyone and everything!

Another Triumph Triple head that needed a few things correcting.It had a dent in the rocker box and in the gasket face.....
23/05/2026

Another Triumph Triple head that needed a few things correcting.
It had a dent in the rocker box and in the gasket face.. plus a damaged head stud hole all of which I welded and peened to toughen up the alloy and then machined.. the biggest problem was the centre spark plug hole had been helicoiled on the p**s and was not sealing at all.
So we mimicked the angle and position off the previous Trident head, by using a threaded adaptor and the digital spirit level… opened up the hole and threaded it 11/16” x 26tpi and recessed the top … made a headed alloy threaded bush and screwed it in FT with 648 loctite and spotted it down and fettle the inside to suit the chamber.
We made new colsibro guides with facility for our modern stem seals on both inlet and exhaust.. this was how it was … whether you fit them on the exhaust is up to personal choice.. personally I wouldn’t.
It had 6 new seats in top quality high expansion material suitable for modern petrol.
I matched the manifolds to the ports and we marked them Right,Middle and Left so they could go back the same.. we supplied new G&S short top valves, inlet studs and insulators.
And we also fitted our billet exhaust stubs.
I did go in today but boy is it hot and really didn’t sit well with me to be getting covered in oil and swarf..
So I did a bit of admin and came back home …it too hot for the dogs anyway at work.. they are better off here..

This head was given to me last year at Beaulie… that’s Sept last year😳😳😳….we are getting stuff done but this type of job is fairly time consuming and when you get as much of it as we do it can pile up so this week,we sent more out than came in, I’m limiting what we take on to the regular customers emergency jobs and not projects..
I have turned down 20 jobs in the last two weeks … some so ridiculous it hard to believe… I think YouTube misleads lots of people ..giving them untruths just to get clicks.
So the only way at the moment to get less in the shop is to filter out and be brutally honest and possibly we will have to do that on an ongoing basis..
There just isn’t enough of us..

One thing won’t change is our commitment to quality and for everyone’s information the invoice for all the labour and parts inc VAT was
£1900 … our hourly rate is half a main dealer garage but more than a tyre and exhaust centre.. and we have more machines and individual tools than both of those together😳😳😳

Address

Unit 3 Meadow Works Business Park, Kenton Road, Debenham. IP14 6RP
Stowmarket
IP146RP

Opening Hours

Monday 9am - 5pm
Tuesday 9am - 5pm
Wednesday 9am - 5pm
Thursday 9am - 5pm
Friday 9am - 5pm
Saturday 9am - 5pm

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