bottom end gone again
13 February 2010, 02:29 PM
#1
bottom end gone again
1200 miles into rebuild and got a nasty knocking from block at 2500 rpm, fuel pump died in tesco car park, fit new pump in car park, drove 5 miles home and knocking like hell.
new acl race bearings only 1200 miles gone, no oil light etc on tho, and idle well, only when i hold revs up a bit.
any ideas?
new acl race bearings only 1200 miles gone, no oil light etc on tho, and idle well, only when i hold revs up a bit.
any ideas?
13 February 2010, 02:47 PM
#2
I'm sure others will be along with the usual questions in a minute...
- who did the rebuild?
- was the crank reground (if so, the left over metal particles will have probably wrecked the bearings)
- did you replace the modine? Assuming you had bearing failure the 1st time, there will be particles in the modine which may now have wrecked the new bearings
Other than that it probably depends on what else you replaced, running-in procedure etc.
- who did the rebuild?
- was the crank reground (if so, the left over metal particles will have probably wrecked the bearings)
- did you replace the modine? Assuming you had bearing failure the 1st time, there will be particles in the modine which may now have wrecked the new bearings
Other than that it probably depends on what else you replaced, running-in procedure etc.
)
14 February 2010, 11:07 AM
#9
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Oil pressure can still read normal even though its knocking. Cause can a whole host of reasons, Swarf, Clearances, rod Bolt Tq incorrect etc etc, pulling the block apart should show you whats happened here, catch it while its early and you shouldnt see to much expense.
14 February 2010, 12:00 PM
#10
Check the oil pressure first to see what you have.
Then bring the revs up to approx 2500rpm and as you release the throttle,if the big ends have failed you will hear them as the throttle is released.
As above in Un-Ink's post - the only way to narrow down the cause of failure is to strip it down, start with the oil pump to see if the PRV has jammed open in the relief position.
Mick
Then bring the revs up to approx 2500rpm and as you release the throttle,if the big ends have failed you will hear them as the throttle is released.
As above in Un-Ink's post - the only way to narrow down the cause of failure is to strip it down, start with the oil pump to see if the PRV has jammed open in the relief position.
Mick
14 February 2010, 01:28 PM
#12
Even with a modified 'straight bodied' PRV, they can and do jam open if there is the slightest bit of debris left in the oil system.
You can remove the PRV 'in situ' with a ball ended 10mm allen key as a quick check but unfortunately it sounds like the damage has already been done
Mick
You can remove the PRV 'in situ' with a ball ended 10mm allen key as a quick check but unfortunately it sounds like the damage has already been done
Mick
14 February 2010, 07:55 PM
#13
well engines out, not fully stripped yet, head left to remove and oil n water pump.
the sump was full of copper shards, cudnt see much, con rods looked together, tomorro after work il remove heads and split block.
soon find out the extent of damage and if its damaged bores etc
the sump was full of copper shards, cudnt see much, con rods looked together, tomorro after work il remove heads and split block.
soon find out the extent of damage and if its damaged bores etc
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