johny

I make that about 41mpg which is good👍

Rimmers seem to think 154479 and UKC1450 are the same and TKC3002 is for single rail(?) but I would want to bet on it...

I know Triumph changed gear teeth angles during the manufacturing life of some gearboxes but not sure which ones and when. Presumably it was for quieter running and/or thrust considerations and of course makes certain gearsets non mixable....

What are the serial number letters on the engine?

Could be worse. I had a Herald many moons ago where the top of one of the pistons separated so the engine still ran but of course one cylinder had no compression! It wasnt till I got the head off and saw three pistons would go up and down while the 4th appeared to just sit there at the top of its stroke☹️

Yes good idea and for future reference when doing a compression test its worth doing a second after putting a cap full of oil in each bore. This is called wet and dry tests and the oil can temporarily improve the piston to bore sealing so if the second reading is substantially higher it indicates a problem with the bore/piston rings....

It would have been interesting to put a little petrol in each combustion chamber to see how quickly it drained past the valves. Anyway as you say now its apart you can check valve guide wear, head flatness, valve spring condition etc and then decide how much you want to spend...

sorry cant open those pics...

Should be able to feel amount of play in the shaft Dave by side to side push-pull....

Theyve got part number 158695 for 1500 and GMC1023 for 1300. Both in stock but big difference in price...

Rimmers certainly list two different clutch master cylinders for the Dolomite 1300 and 1500 but not sure how they vary....

I did wonder about the clutch hydraulics because as it seems the 1500RWD has a bigger clutch than the original Herald one then the master cylinders might have been different sizes....

Hope youre lucky and let us know the outcome👍

I reckon theres a very good chance the PO just bought an engine/gearbox out of a scrapper and stuck it in! In fact it was a very good choice because they got a 1500 (personal taste I know) but with a 3 rail box so no problems with propshaft length or gearlever position etc

I suppose it would be nice to have replacement box ready to go in as old one comes out...

In fact that clutch plate that Rimmers sells is for non UK 1500 Spitfires that had 3 rail boxes! Its bigger than the MkIV Spit clutch and I guess they probably also used it in the 1500 RWD...

Seems like the 1500 RWD (not Dolomite) being earlier was fitted with a 3 rail box so should have a 10 spline shaft...

Well I think we decided you have a 3 rail gearbox from a 1500RWD which I reckon should use the following friction plate: Clutch Plate -10 spline - 7 1/4 inch Diameter - GCP103 (rimmerbros.com) If that is the case then I agree with Josef, although this is a bigger diameter clutch than the one used in a MkIV Spit it should all work no problem and even first gear ratio should be the same....

Yes to the electronic ignition trigger so its interesting to check the timing with a strobe on number 6 cylinder which of course should be exactly the same as where you set it on number 1....

Yes the valve clearance could be interesting because rather than melting pistons running weak is more likely to cause exhaust valve seat recession so the gap closes up...

Dave, youre sure theres no extra air going in that cylinder from some where? Go round the manifold gasket with starter spray or similar to see if the revs change... Also I forget now but I assume youve tested compressions and checked valve clearances?

Heres from Canleys Alloy Caliper Brackets info: [There are two types of bracket available, one with Type 12/14 caliper mountings and one with Type 16 caliper mountings. Both types can be interchanged between early Herald and Vitesse/GT6 vertical links to allow different spacings for various brake upgrades. The Type12/14 brackets have a 3.25" caliper bolt spacing, Type 16 is 3.5"] They also do a big brake kit and it looks like their 4 pot alloy caliper uses the type 12/14 bracket....

Yes theyre the ones that have the correct hole spacing for fitting bigger calipers to the 2L cars so unfortunately for you making them highly sought after. Hence its worth making them in alloy....

Yes theyre the ones you want to upgrade Vitesse or GT6 brakes arent they?

Just as long as theres sufficient end play with the new thrusts. I believe you can take metal off the back of them if necessary but it must be a pain....