No compression on 225 engine cylinder 1

[Blindbandit]

My very long Meglio project is kicking my ass.

I purchased a megane 225 engine from a mate that had come from a running 225...until it crashed.

He put a new sump and big end shells, oil pump, water pump, head off and re-ground the valves and new gaskets etc.
Ive done a compression test and have no compression on cylinder 1.
How do I best diagnose the issue without removing the head if its not needed.
I understand that it may be a stuck valve, bad rings etc but I could do with pin pointing the issue so I dont waste cash.

Any help much appreciated.

Dan

 

[RSRowe]

A leak down test will be a good indicator

 

[Foxspeed]

if you have limited access to tools....put it on tdc no1 and fill inlet/outlet ports with wd40/diesel and see if it leaks out/level goes down that will prove the valves...

or a "wet" compression test...ie a few squirts of oil in the bore and compression test...see if anything improves

 

[Blindbandit]

I've got to get the engine out ....again anyway to fit an R26 box and custom loom, so tools and access isn't an issue. It was just the best way to diagnose weather it's the bottom or top of the engine. Ill try the things that have been mentioned so hopefully that will tell me if its a sticky valve or a dead ring.

cheers for your help.

 

[pepinosport]

I bought a cheap bore scope on amazon, it has light and an additional lateral camera that I use to have a glance at the head/valves. It saves a lot of time when diagnosing. You'll probably find a burnt valve or a very bad valve seat or even ringland failure if your friend didn't clean carbon build-up in the rings when rebuilding.

 

[Blindbandit]

I bought a cheap bore scope on amazon, it has light and an additional lateral camera that I use to have a glance at the head/valves. It saves a lot of time when diagnosing. You'll probably find a burnt valve or a very bad valve seat or even ringland failure if your friend didn't clean carbon build-up in the rings when rebuilding.

Ive got a Temu camera, ive gone in through the spark plug hole, I cant see any valve contact or burn holes etc. My mate ground the valves and let petrol sit in them overnight as a leak test. The engine hasn't run since it was assembled.

Im away at the mo, but once I'm home I'll get the engine out, take the exhaust and inlet manifolds off and then have a look with a camera.