bent crank???

eav8 · 21-01-2006, 10:41 PM

how do I test for a bent crank without removing from the engine

mcflux · 21-01-2006, 10:45 PM

I don't mean to sound like a smartarse, but wouldn't starting it give you a fair idea?

eav8 · 21-01-2006, 10:49 PM

well that,s just it...I have started it and is sounding wrong (a catch slap type of noise) but it sounds in the top end....I have removed the driver's side head (v8), checked lifters, removed gearbox,bellhousing, starter motor....when turned by hand nothing is catching...No bores have scoring (thought broken ring)

LUXO_8 · 21-01-2006, 10:50 PM

its not something craxy like something on the engine tapping against the body work?

eav8 · 21-01-2006, 10:52 PM

thought of that but a bit tooo loud I feel...I have a mobile phone recording of it running but don,t know how to upload it for viewing (.3gp format)

eav8 · 21-01-2006, 10:59 PM

anyone? I'm taking the sump off tomorrow and would like to not have to completely dismantle the engine unless absolutely neccessary

montyv8 · 22-01-2006, 12:53 AM

could it be a stuffed gudgeon pin? i think thats whats wrong with my xc's 351. a steady knock, like its on one cylinder. maybe ask in the clevo forum.

mik · 22-01-2006, 01:10 AM

if the engine done heaps of ks might be piston slap

svo347 · 22-01-2006, 01:19 AM

Quote:

Originally Posted by eav8

how do I test for a bent crank without removing from the engine

Depending on how bad, you cant..

eav8 · 22-01-2006, 10:45 AM

Engine recently rebuilt by myself..First full rebuilt as 302c then got crank etc and converted to 351c...This is the first time I have undertaken a full engine rebuid so I was expecting some teething problems.

I just would have thought that with a bent crank that when turning it by hand it would have gotten noticably harder to turn in certain positions?

svo347 · 22-01-2006, 04:05 PM

check your main bearings

eav8 · 22-01-2006, 05:02 PM

thanks for suggestions it turned out to be a dodgy valve guide install. All but 1 valve stem (exhaust) had been fully removed. The at fault one had merely been fitted with and insert of some kind. This insert then proceeded to seize up on the valve stem causing it to catch a little then release violently..thus a slap sound....Needless to say the old valve guide was nothingbut a jagged mess. It just disgusts me how they could do all the others completely then shortcut so badly....Must have been getting near to knock off time for the day. :(