How to diagnose a big end bearing problem with motor out

[1989RS]

I have pulled my motor out as i thought the car had blown a big end bearing. but now i have pulled it out and pulled the sump of everything looks fine. is there any certain way to tell if its blown i.e. play in the big end or small metal filings or not free turning. I was also told that it may be a melted piston is there any way to check this without taking the heads off. would there be any tell tale signs e.g. grinding noise from bores or hard to turn the motor over any help or advice would be greatly appreciated.

[Guest]

BEB will put metal filings in sump

And if it was knocking because of BEB failure there will be play in a rod bearing

[1989RS]

ok now i feel like a penis because on closer inspection the left hand exhaust gasket was leaking which could explain the thumping noise

[Guest]

 1989RS said:

ok now i feel like a penis because on closer inspection the left hand exhaust gasket was leaking which could explain the thumping noise

Gee that could earn MUPPET of the MONTH AWARD

Stink as for you

[1989RS]

yeah but is there anyway of diagnosing a melted piston or damaged piston

[rex-leggy]

the damage will most likely be visible . beb can look like the pictures in the first page of my thread

http://www.clubsub.org.nz/forum/index.php/topic,21625.0.html

[kamineko]

 1989RS said:

ok now i feel like a penis because on closer inspection the left hand exhaust gasket was leaking which could explain the thumping noise

i'm tempted to loosen a side off just so i know what that sounds like...

[Ryan]

Compression test when it was in the car would have given you some idea regarding melted piston. How many KM's has engine done? May as well rebuild it now it's out

[Guest]

 1989RS said:

yeah but is there anyway of diagnosing a melted piston or damaged piston

yeah, diag properly to isolate which cyl before engine removal

or completely strip the engine and get the pistons and bearings out to check

[1989RS]

would anyone be able to loosen the manifold to see if it made the same noise

[1989RS]

and the motor was rebuilt about 10,000km ago but i was told the crank didnt need a regrind because it was in ok condition so trusting the engineer i didnt do it.

[Ryan]

 1989RS said:

would anyone be able to loosen the manifold to see if it made the same noise

I've had it happen before, I never thought it was a big-end lol didn't take long to figure out exhaust leak, if you under the car with it running it's fairly obvious.