steve2286w
Well-Known Member
Welcome to LZ, Glad you found the problem, just re messing with valves was turners saying don’t bother lapping them in?, I’ve just had some delivered and was about to grind them in
I would imagine they meant the existing valves.
Cannot see an issue grinding new ones in, apart form the tedium that is!
Engine now purring - I took the head off and lo and behold the gasket had blown between 3 and 4. Those two cylinders were beautifully clean and decarboned by unburied fuel. Rebuilt yesterday and everything working. Back to considering a chain replacement as engine misses a beat on idle once in a while and puffs out some white smoke.
Attachments
I would say a miss is ignition related rather than the chain.
Ignition as in fuel delivery? Compression?
Ignition as in fuel delivery/ compression ?
Neither, I would be checking/replacing the spark side ie coil/distributor/points/capacitor/leads/plugs etc.
Iirc the distributor shaft bushes wear allowing the shaft to wobble and mess up the timing, might come up on a search on here/google.
Lynall, it’s a diesel so I’m going to have the injectors checked incase they are squirting neat duel rather than atomised fuel. Also
I have read that the injection pump drive gear can wear causing an injection timing lag of a few degrees - haven’t been able to find one of these though. Thanks for all your help
Turboman
Mab An Gov
Injector service is always a good idea. Those injectors are a service item, there is an interval at which they should be checked and serviced. From memory, it might be 40k Miles on that kind of engine.
But nobody seems to bother any more, they just wait until a problem develops before looking at them.
Oops, No idea why I thought it was a petrol!
Yes injectors worth a look, but I doubt they will give you the small miss, could also be pulling some air in at one of the pipe joints/lift pump, get enough air = hiccup, then off it goes again until enough air builds up again.
Iirc there is also a gauze filter in the injector pump feed pipe in the inj pump itself.
