Question about 1999 Isuzu Rodeo

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Loud knocking from engine, could it be a throw out bearing?

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  • wolfemoney Apr 23, 2010

    I was actualy thinking rod bearing, there was no oil left after I got it back from shop I should have known but did not untill I heard the knocking.
    Thanks for the coments back on the vehicle.



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No. The throw out bearing is in a manual transmission. And it wouldn't be knocking, it would be screaming. The knocking, is, probably the timing belt tensioner. They get loud, especially on Rodeos and especially when they give out. Unless the engine is missing and skipping, I would suspect the tensioner. have you had the timing belt changed? Good thing. Get a new belt with the marks on it, and the tensioner, and a water pump. Change them all while you are in there. Trust me. I have 3 Rodeos. If you think it might be something else, a compression check might help, Or get a mechanic with a stethoscope to put his ear on it. Or get a piece of 1/2 dowel about 3 ft long, cup your hand over one end and put your ear in the cup and touch the other end, carefully to any part of the car while running, watch out for the fan and listen to the different parts. You'll here it and know where it is. Hope this helps.

Posted on Apr 23, 2010

  • punkermom125
    punkermom125 Oct 10, 2012

    we are having the same problem and changed the tensioner and still have a knocking do u have any other sugestions



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Hi Bill 609!

Definitely sound like a rod insert to me. With my practiced ear, I cna tell the difference between a main bearing knock (deeper sound, more of a thudding noise), rod bearing knock (not so deep, gets louder as the engine revs, kind of a rat-tat-tat-tapping noise), and a wrist-pin knock (not quite as loud or deep and gets louder with decelerating RPM).

You can tell which cylinder the knock is on by removing the spark wires to each cylinder one at a time while the engine is still cold enough to knock. (Don't get shocked!)... when you hit the right one, the knock will noticeably quieten or possibly quit altogether!

The 300 Six is a tough old motor and I have seen them survive for years with rod knocks... Just allow the engine ample warm-up time before driving, drive on the conservative side, and keep an eye on oil level and pressure.

An oil and filter change to a higher viscosity oil with a can of STP Oil Treatment (Or something similar) is a good band-aid fix for now, I would recommend Castrol GTX 20/50w... in my opinion, Castrol is the best brand out there, I use it religiously - - - I have a customer with a Chevy Suburban who has followed my advice and adhered to good maintenance discipline that has racked up over 300,000 miles on the original small block and no consumption or engine issues, and is still running strong!

Bill, the temporary fix will work for a while, hopefully a long while --- BUT when it reaches the point that the knock doesn't go away, it is time to park it until the real repair can be done --- otherwise you risk throwing a rod and destroying your engine beyond repair!!!

Please don't hesitate to post a comment or ask if you have further questions. I hope this information answers your question and concerns and wish you well with the Ford. *** And remember to rate my assistance... Your rating is my only compensation for helping you in the free blog!!!***


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