Zetec dropped a cylinder?
Discussion
2L Zetec in a Caterham.
Car has been faultless then slowed at a junction and a misfire started.
I drove home 2 miles incase it refused to start after stopping to look .
No2 exhaust is cold, swapped the plugs and still cold, the plug is getting wet.
My compression tester won't fit as there's a collar before the thread starts and the the testers thread doesn't reach.
There is a spark.
I've new plugs on order but won't get a chance to investigate till Saturday so any help on what else to check would be good.
It runs on fuel injection.
Car has been faultless then slowed at a junction and a misfire started.
I drove home 2 miles incase it refused to start after stopping to look .
No2 exhaust is cold, swapped the plugs and still cold, the plug is getting wet.
My compression tester won't fit as there's a collar before the thread starts and the the testers thread doesn't reach.
There is a spark.
I've new plugs on order but won't get a chance to investigate till Saturday so any help on what else to check would be good.
It runs on fuel injection.
Thanks, It's odd as it sounded like a misfire whilst slowing for a junction, I was sure a plug had failed, then maybe a blocked or stuck injector.
I did put a rubber bung over the plug hole and there was pressue, and it felt quite a bit but when I eventually got a extension for my pressue tester
it fails to register on that bore at all.
I've taken the exhaust off and the valve bits I can see look fine.
The spark plug that came out showed no damage.
Ordered a borescope this morning that should arrive tomorrow
I did put a rubber bung over the plug hole and there was pressue, and it felt quite a bit but when I eventually got a extension for my pressue tester
it fails to register on that bore at all.
I've taken the exhaust off and the valve bits I can see look fine.
The spark plug that came out showed no damage.
Ordered a borescope this morning that should arrive tomorrow
Camera from Amazon has only just arrived, first impression is the piston is fine with no damage.
Exhaust valves look ok but I don't think one of the inlet valves is closing properly, i should have a bit more time tomorrow to check.
This pick the valve should be fully closed.
The clean part of the valve stem at the top i would expect to be hidden?
Exhaust valves look ok but I don't think one of the inlet valves is closing properly, i should have a bit more time tomorrow to check.
This pick the valve should be fully closed.
The clean part of the valve stem at the top i would expect to be hidden?
Edited by tight fart on Monday 14th May 07:59
This has really dragged on, car is still not going.
I got the rebuilt head back only to have no compression on number 3, Finally found time to look at it again
and the diagnosis was hydraulic valve buckets locked, so it all came apart and the buckets went off to be done.
Back together again and still loosing compression, ok with cams out.
So locked hydraulics again.
They are about to come out again, and thoughts on stopping it happening again?
I got the rebuilt head back only to have no compression on number 3, Finally found time to look at it again
and the diagnosis was hydraulic valve buckets locked, so it all came apart and the buckets went off to be done.
Back together again and still loosing compression, ok with cams out.
So locked hydraulics again.
They are about to come out again, and thoughts on stopping it happening again?
Boosted LS1 said:
Remove followers and whack them on a hard surface. The plunger will fall out, eventually. Give them a clean and refit. That said I find it hard to believe a 'stuck' follower's holding a valve open.
Have you filled the port with wd40 to see if the valve's sealing?
Didn't try wd40 but with the cams out they all held air pressure (using an air line)Have you filled the port with wd40 to see if the valve's sealing?
The followers all came out and went back to be de-hydrauilc'ed and with the cams back in it's not holding pressure.
Finally sorted after nearly 2 years.
After taking the followers out and de hydraulicing again they were still sitting at different heights,
even with enough pressure on them to take out the slack. £130 for a new set and now all sounds good.
Just need some slightly better weather to road test it.
After taking the followers out and de hydraulicing again they were still sitting at different heights,
even with enough pressure on them to take out the slack. £130 for a new set and now all sounds good.
Just need some slightly better weather to road test it.
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