dropped valve

[redcrofter]

hi everybody stag been standing for 2 years engine turned over then seized.
just found valve on offside has snapped off.
if anybody can give me any advice as never stripped v8 before or is there a mobile mechanic in west lancs .
worried what else will find .
thanks:

[jeffsstag]

hi your cylinder head will have to be removed,DO NOT attempt to turn engine over any further or you may cause terminal damage,i have an Haynes manual you can borrow and I will advise you if you need help as will other members as they are a great set of guys on here cheers jeff.ps if you need book I will post it you.This would be better for you in technical section.

[Rubce]

Hi

Sad to hear of your problems. If you are nervous about working on the engine it might be worth your while calling Keith at Tynwald in Warrington. He specialises in Stags and has done engine work for several people on here including ukbiggles and Just Peter.

Regards

Bruce

[redcrofter]

hi jeff still trying to work out how to use forum never mind fixing stag!!!!!!!!!!!!!
thanks so much for offer of manual i already have one.
iam at the stage of removing head iam at a stand still as not sure about timing chain.
i pressume i will have to take off timing chain cover to release the tension.
i cant turn engine over to the timing marks as engine locks up?
any advice a great help thanks

[redcrofter]

thanks bruce will bear him in mind ( if got one left after this )

[Colonel Mustard]

I can definitely recommend Kieth at Tynwald...not only an expert with stags...but a true gent too. Give him a call 07774258546

Chris

[grumpy2]

You won't need to release the chain tension. The manual explains how to remove the chain with sprocket from the camshaft and secure it so it doesn't slip a tooth. One thing triumph dud think through when designing the engine.

Good luck getting the head off!

Gary

[redcrofter]

just read manual again
and it all came to me funny how you need someone to point out the odvious.
thanks i think iam nearly there.
easy taking them apart"""""""" cant wait to see if it goes back together

[jeffsstag]

hi a couple of tiewraps hold chain to sprocket so you can undo it without it moving if you need any help give me a shout on here usually on at night

[redcrofter]

hey head off and to my surprize NO DAMAGE valve head just snapped off.
only thought now is WHY and are the rest ok?
anyway everybody who helped thanks will be putting you all to the test when rebuild.
thanks again

[milothedog]

hi a couple of tiewraps hold chain to sprocket so you can undo it without it moving if you need any help give me a shout on here usually on at night

That's what the extended brackets and studs on the cam shafts are for, they also prevent the tensioners coming out any further

[redcrofter]

thanks jeff might need you on reasembly thanks again

[flying farmer]

The odds are the reason the valve snapped was that the cam follower or valve stem was corroded to the head after a two year lay up.


If it was one of the two rear cylinders where the waterway is, it may be as a result of damp from a leaky inlet manifold gasket.

The cam pushed the valve open but the spring wasn't able to shut it again resulting in it being clobbered by the piston. The valves normally bend (at least the inlets do) but if it is an exhaust valve that has snapped it may be because the metal is harder.

At least you got the head off quickly, a miracle in itself!, The rest of the rebuild should be relatively simple, best of luck!

Neil

[jeffsstag]

just belt and braces

[redcrofter]

hi everyone on further examination all the larger valves have all seized ,
got them out with the socket and hammer trick but not sure how to get them back in as my valve spring compresser will not fit in recessed hole anyway will let you know how i get on !!!!!!!!!!1