Question about 1985 Nissan 300ZX

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MY ENGINE KNOCKS AFTER DRIVING A FEW MILES

I have a 1985 nissan 300zx turbo and recently I started experiencing a loud knocking noise from the engine after driving the car a few miles. I get on the freeway then 15 minutes later when I exit and come to a stop I can hear the noise. Sounds "clank clank clank"

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  • friscoboy77 Feb 04, 2009

    Dont know much about cars so can you be more specific about exactly what a rod is and how the problem may have come about? Thanks

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You have a rod knocking in the engine

Posted on Feb 04, 2009

  • Ronnie Houston Feb 04, 2009

    a rod is an internal part of you engine attatched to a piston on the bottom part of the motor. one of those is going to break throguh the side of your motor.its called a rod

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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!!!***

Thanks!
-WildBill

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