No compression in cylinder two

Tiny
BANELE LUNGELWA DONDOLO
  • MEMBER
  • 2014 RENAULT CLIO
  • 0.9L
  • MANUAL
  • 87,000 MILES
Hi there,

Would really appreciate help on this. My car refused to start one morning and it was towed to the dealership. Dealership sighted no compression on cylinder 2 and recommended removing cylinder head to check issue. Report I received back:

CYLINDER 1. 72, 22 - 72, 22
2. 72, 23 - 72, 22
3. 72, 23 - 72, 22
honing pattern still visible
bottom end measure only 0, 01mm ovality and should be
okay. Recommend to remove pistons for inspection due to
valves hitting pistons. No guarantee can be given to bottom end if only cylinder head refresh is done.1 550.00 550.00 t engineering to cylinder head (strip, check and report,
pressure test, vacume test, reface cylinder head 0, 10mm, reface 12 x seats, replace 6 x intake valves, replace 6 x exhaust valves, check valve spring pressures and lap and assemble. Shimming chemical cleaning to components consumables/sundries.


They are recommending a new engine, is that really necessary?

Mind you this car had just come back from its major service and had the cam belt changed and 4 days after it refuses to start.

Please help.

Thank you.
Wednesday, February 5th, 2020 AT 11:43 AM

5 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
If the valves hit the piston then the most likely cause of the no compression is the valves are bent.

Since this is the case, then they are most likely correct because both the piston (which is in the lower end of the engine) and the valves (which are in the upper end) are damaged which means both major parts of the engine are damaged.

The thing that gives me pause is that the timing belt was just replaced. Did they inspect the belt? Was it out of time? I suspect it jumped timing and caused the valves to hit the piston. It doesn't change what needs to happen but at least it will explain it.
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Wednesday, February 5th, 2020 AT 2:43 PM
Tiny
BANELE LUNGELWA DONDOLO
  • MEMBER
  • 3 POSTS
Hello. Dont know if belt was inspected. Okay thank you for the feedback, much appreciated.
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Thursday, February 6th, 2020 AT 1:32 AM
Tiny
STEVE W.
  • MECHANIC
  • 13,572 POSTS
From the description it sounds like the new cam belt was installed improperly and it jumped time and the valves hit. A quick test for that is called a leak down test. It involves using a tool that applies air pressure into the cylinder while the cylinder is locked into position at top dead center. At that point the valves should all be closed and the air should only have a slight leakage around the piston rings. However if you can hear air in the intake system or the exhaust system you have valve damage.
Another thing that could be done would be to use a borescope (tiny camera that can go through the spark plug hole) and inspect the valves and pistons without taking anything apart.
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Friday, February 7th, 2020 AT 9:26 AM
Tiny
BANELE LUNGELWA DONDOLO
  • MEMBER
  • 3 POSTS
Thank you Steve, I also suspect as much. Have lodged a complaint into this and matter is currently "under investigation" by Renault. Appreciate the feedback.
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Friday, February 7th, 2020 AT 9:38 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Keep us posted with what they find. Thanks
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Friday, February 7th, 2020 AT 3:10 PM

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