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Re: Rod and main bearing knockcured cheap!
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Re: Rod and main bearing knockcured cheap!



A noise like this is much worse on a aluminum block motor.  The aluminum
transmits noise much better than cast iron.  

At 02:13 PM 2/11/97 -0600, Jim Isbell wrote:
>This is about a Cadillac V8, but applies to any engine, Jaguar included.
>
>I have been worried recently about a rather prominent knocking noise in my
>Seville (I keep it for transportation on the rare occasion when the Jags are
>all in the shop) .  I figured it was the bearings again.  I had them
>replaced a year ago and this engine has a reputation for trashing bearings.  
>
>It was alot cheaper to repair than I thought.
>
>The symptom was a "RRRump---RRRump....RRump" noise at idle that had a
>distinct knock with each cycle. I have heard it before on the XJ6, but had
>forgotten how much it sounds like a rod knock.
>
>The cure is , tighten the fan and accessory belts.
>
>They will get loose enough that they oscillate at low RPM.  The noise will
>go away as the RPM increases.  This is the clue, because bearing knocks
>usualy increase with RPM.
>
>So before you tear down an engine because of a noise, tighten the fan belts.
>                                                                            
>         JIM I.
>
>---------------------------------------------------------------
>If God had intended fibreglass boats he would have planted fiberglass trees.
>---------------------------------------------------------------
>
>1970 XKE 2+2
>1974 Bricklin
>1978 Roberts 44' steel ketch, "Millennium Falcon"
>         "Its the ship that made the Kessel Run in less than twelve parsecs."
>                                        Han Solo
>1979 Lola T540 Formula Atlantic
>1985 XJS
>1985 XJ6
>
>
>

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