Thread: my disco problems, help!

Originally Posted by glenn82

hi
i got 94 Es v8 diso.
finaly got it back from repairer today.
was there to fix possible bent push rod's or sticky lifter. put apperently this wasnt the cause for the knocking noise in the top end. meach said theres no knocking sound when tested

so therefor with the rear main seal being replaced.
you think the knocking noise would go ,app engine was low on oil from rear main leak)
well it hasent(stoped knocking) and murphy law it only started making the noise on way home from mech.

any one else heard of this prob. might have to get it checked over but it will be done by some one else.
i have a bad taste in my mouth afer the last lot of dealings with the mech

Was it low on oil?

If it was low on oil you could have some serious issues with the engines bottom end....

had oil change this morning, noise is from the top end

Could be low oil pressure caused by a blocked filter with a failed or sticky bypass valve.

It sounds strange I know but I have had 1 on a 302 clevo but not a rover where it was an intermittant problem.

I ended up swapping cars for a week with the freind who ownned the car before I could get to hear the noise which really didnt tell me much as when I stopped the car or gave it a rev it sometimes went away and sometimes didnt.

I would be checking the oil pressure before running it for too long to make sure your pump is working properly and Im assuming you changed the oil filter with the oil so that should eliminate that.

well yes it does it on idle. and the disapears on acceleration. its going in again on sat. maybe it is a noisy lifter.

Originally Posted by glenn82

well yes it does it on idle. and the disapears on acceleration. its going in again on sat. maybe it is a noisy lifter.

Just get them to whack a guage on to check the pressure as low pressure will make lifters noisey.

what causes low presure? oil pump stuffed??

Why did they change the rear main? Was it definitely leaking? Get a pressure test done as sometimes the heads do not mate well due to poor metal hardness. This leads to a blowing of the head gasket (subtely), often at the rear piston on the left of the vehicle. This pushes oil out and through the bell-housing, mimicking a rear main (not common).

Worth a quick check.