Possible slipped Timing Belt (1.8t)

[Sheraton]

How'do folks

I've mentioned this in a previous post (1.8t misfire)

I suspect the Timing Belt may have slipped on my 75

I may be wrong - however, this has me a bit concerned r.e other potential causes of my initial misfire - I don't want to run the engine at all now, so won't be trying new plugs/coils...


r.e a slipped belt - If a belt HAS slipped - is it possible to diagnose using the timing marks ?

I was thinking - if the belt has slipped - i'll be rotating the crankshaft in Vain as the marks won't line up - or would it simply be a set number of rotations of the crankshaft would guarantee a thorough check ? .... I'm not sure if that makes sense as to what my concern is.


my current thinking is - I have to just go ahead with a belt replacement - and hope there has been no damage caused - if there HAS - i'll find out after replacing the belt


what damage is likely to occur following a belt slipping and timing being off ?



Paul.

[philm]

Firstly i would check all timing marks line up as they should that way you can be sure everything is ok.
Then you can start to find the the cause of the misfire.
If the belt has slipped it could be drastic or you could be lucky & no damage at all

[Al_B]

If you turn the engine so the front pulley mark lines up - the cam belt change one not the TDC one - then the lines across the cam pulleys should show if it's all in sync or not. I think a stock engine can be one tooth out without causing contact.

If there had been any piston/valve contact and a bent valve you'd have a misfire or uneven idle. Mine sounded like a Subaru flat four at tickover when I bent a valve.

[Shide]

Take a look at my thread in the 'Tech help', 1.8 belt disaster to see what you are facing, good luck!

[Sheraton]

I pulled the top cover off earlier had a wee look - nothing much to report - other than maybe the tensioner seemed off it's mark - there was a maybe wee bit slack in the belt not too sure

I don't have a 22mm?? socket for the crank pulley - and it got a bit cold and dark - i'll acquire a 22mm socket and rotate the crank to check if the timing is off.

I'm of the feeling - i suspect it has slipped - so i should go ahead and replace the belt with timing/tension correct - fire up the car..........and see if any damage has been done from there.

what's the thinking on this ?

if any damage has been done it's already done - and i'll know right away

I think i will have occured some damage to the valves(?) as i heard sounds you don't want to hear - didn't run for long tho who knows i guess we'll see.





Paul.

[slovcan]

Originally Posted by Sheraton

I pulled the top cover off earlier had a wee look - nothing much to report - other than maybe the tensioner seemed off it's mark - there was a maybe wee bit slack in the belt not too sure

I don't have a 22mm?? socket for the crank pulley - and it got a bit cold and dark - i'll acquire a 22mm socket and rotate the crank to check if the timing is off.

I'm of the feeling - i suspect it has slipped - so i should go ahead and replace the belt with timing/tension correct - fire up the car..........and see if any damage has been done from there.

what's the thinking on this ?

if any damage has been done it's already done - and i'll know right away

I think i will have occured some damage to the valves(?) as i heard sounds you don't want to hear - didn't run for long tho who knows i guess we'll see.





Paul.

Paul, don't change anything until you have verified by the marks that the belt has actually jumped. If it's not loose, jumping a tooth is much less likely.

Good luck,
Glenn