you might have spun a rod bearing , common thing on v8s, usually number
7 cyl it will be .
knocking noise depends on type of noise and where from, if its a
ticking noise that will be the came area probably, if its a thudding or
ding ding noise then probably the crank .
to make a start you could drop the sump off and check rod bearings on
number 7/8 cyls , just take cap off number 7 and 8 rods and see if
there is a step in the middle of the crank journal somewhere and also
if one of the rod bearings has rotated in the rod end and cap .
if youve spun that bearing then youll need a new conrod and the crank
grinding on that journal in the least .
you can do the crank in the engine but really the heads will need to
come off and to be honest it wont be an easy job to put crank in and
torque all the bolts up and set everything up .
better option would be to find another engine and swap over , or to
build another engine up for it or buy a reground crank from someone
like REAL STEEL or v8tuner.co.uk .
problem with getting reground crank is that if any of the rods have
gone youll still need to replace these as well .
usually with any bearing trouble at the crank it will be noticeably
noisey upon a cold startup in mornings after being left overnight .
if you drive with knocking rod bearing then you could end up putting a
rod through side of the block and completely wrecking it all , so if
you want to save the engine for a rebuild its best to forget drving the
vehicle and set to work on it right away .
Bill Payer wrote:
> Driving home tonight, the oil warning light started to light when the engine
> was idling at junctions, but went out when the revs increased. I checked the
> engine oil level and it was up to the full mark , after letting it stand for
> a few minutes. There is also a knocking noise. The engine is a 3.9 v8 EFI,
> if it's the original engine, the speedo reads 168,000.
> Could it be the oil pump broken or is it likely to be something like the big
> end gone?
> Thanks.
