Question about 1997 Nissan Pickup

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I have a nevara with a engine knock,i got it checked at the garage, they said it is not from the big ends,but did not know what it was.it gets worse as the engine heats up..d22 model 2.5 diesal

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  • higginspeat Feb 17, 2009

    i had thought it mite be the main bearing but hoped it might be something else..
    thanks..

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If it is an automatic model, check the converter fixing bolts are not loose !

or

big end or main bearing.

Posted on Feb 17, 2009

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Check the timing.

Posted on Feb 17, 2009

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1 Answer

My 2000 Toyota Fourrunner made a super loud knocking sound when I was driving on the highway?


It is hard to say at this range. If a heavy knocking noise that gets louder if you rev up a bit, and it seems to keep time with the engine, you have a failed con-rod (big end) bearing, or less likely, a failed crank main bearing. A lighter knock may be a failed gudgeon pin (small end) bearing. Another possibility is that the engine has eaten a valve or 2.

A blown head gasket can make a noise but it is more like a 'chuff-chuff' sound, like a steam engine.

If the noise has nothing to do with engine revs, look for a loose road wheel or a failed axle bearing, but I doubt it is that.

If you decide it is the engine, the quickest way to investigate is to drain and remove the sump, and look at the big-end bearings. To investigate the valves you could use a borescope, before going to the trouble of removing the cylinder head.

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3.1L has rod knock. I have 20yrs of auto mechanic and built a few engines, but retired now.


If the knocking is from the bottom of the engine, it may be the big end bearings have worn.
Replace them or not? Difficult question.

Replacing the big end (crankshaft/piston rod) bearings may stop the knocking/rumble noise. It depends on the crankshaft..

If the crankshaft has worn oval on its journals, fitting new bearings is unlikely to achieve anything as the bearings may break up due to the oval of the crankshaft. Removing the crankshaft and checking the journals for ovality/regrinding if necessary isn't a 5 minute job.

You say you have good oil pressure. That's a positive.

Personally, in your situation, I would try an engine oil additive that's designed to eliminate knock provided the main bearings haven't worn down to base metal. It's the cheapest option.

Failing that - and again, personally - I would remove the oil pan and fit new big end bearings in the hope that it would work.

The next step, if that doesn't work - would be to remove the crankshaft and have it reground and fit oversize bearings. Or get a 2nd hand engine...

You say the car was given to you for free .. you have nothing to lose. Try an additive first.. molyslip/molybdenum or whatever...

Good luck ...

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Sounds like you ran out of oil and have seized the big end bearings. The knock before they seize. Could also be an inoperative oil pump.

Get it towed to a garage.

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does it get worse the faster you go sound like big ends basically if its these the engine is goosed can be replaced but the age of the car unless its mint condition not worth fixing thats if it that but buy the sounds of it thats what i think hope this helps ivan

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Engine is making loud knocking noise what does this means


could be various things wrong, could be bottom end big end bearing. you need to establish where the knock is ( top end or bottom end ). if it is big end thats knocking then its an engine change ( saves messing about ) or top end ( camshaft ) then its a mornings job. hope this helps

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