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        General >> Problems >> Prop Knock
        
(Message started by: mazzy_j on Apr 26^th, 2006, 1:51pm)

Title: Prop Knock
Post by mazzy_j on Apr 26^th, 2006, 1:51pm

My Scorpio is a manual, and when i lift off the accelerator when changing gear it sounds as thought the prop shaft knocks. Its been doing this since i had it, its just annoying more than anything else >:(

When i had the car up on ramps to change the gearbox oil a while ago, with the car in gear to lock the gearbox i found i could rotate the propshaft by hand easily a fair amount without it turning anything where it goes into the diff and the gearbox. when i rocked the prop shaft back and forth it 'knocked' the same noise it does when i'm driving around.

Any ideas what could be causing it?

Matt

Title: Re: Prop Knock
Post by nuttyscorp on Apr 26^th, 2006, 2:29pm

hi matt check the condition of the donut!

hth

Russ

Title: Re: Prop Knock
Post by mazzy_j on Apr 26^th, 2006, 3:17pm

Mmmmmm, doughnut ;)

Where abouts is it?

Matt

Title: Re: Prop Knock
Post by mr._floppy on Apr 26^th, 2006, 3:19pm

There's a certain amount of prop " Backlash " or freeplay allowed in the drivetrain , too much however and you you do get a clonk on overrun.

Title: Re: Prop Knock
Post by mazzy_j on Apr 26^th, 2006, 3:26pm

I think that must be whats happening with mine. I'll have a poke around for the doughnut later, is there anything that i could tighten up to reduce the backlash?

Matt

Title: Re: Prop Knock
Post by nuttyscorp on Apr 26^th, 2006, 11:56pm

on 04/26/06 at 15:17:43, mazzy_j wrote:

Mmmmmm, doughnut ;)

Where abouts is it?

Matt

its in the middle of the prop, big black rubber "donut" if its excessivley worn, you will "splits" around it, normally running from bolthole to bolthole.

it may not cure all the probs, but will help.

Russ