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Topic: Prop Knock (Read 486 times) |
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mazzy_j
Full Member
Posts: 664
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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
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nuttyscorp
Full Member
1998 (R) 2.3 ultima
Posts: 515
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Re: Prop Knock
« Reply #1 on: Apr 26th, 2006, 2:29pm » |
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hi matt check the condition of the donut!
hth
Russ
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project car :- "84" mk2 granada 2.8i ghia X TURBO (rs 500 box)
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mazzy_j
Full Member
Posts: 664
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Re: Prop Knock
« Reply #2 on: Apr 26th, 2006, 3:17pm » |
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Mmmmmm, doughnut 
Where abouts is it?
Matt
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mr._floppy
Junior Member
Posts: 100
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Re: Prop Knock
« Reply #3 on: Apr 26th, 2006, 3:19pm » |
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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.
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mazzy_j
Full Member
Posts: 664
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Re: Prop Knock
« Reply #4 on: Apr 26th, 2006, 3:26pm » |
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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
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nuttyscorp
Full Member
1998 (R) 2.3 ultima
Posts: 515
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Re: Prop Knock
« Reply #5 on: Apr 26th, 2006, 11:56pm » |
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on Apr 26th, 2006, 3:17pm, mazzy_j wrote:Mmmmmm, doughnut
Where abouts is it?
Matt |
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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
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project car :- "84" mk2 granada 2.8i ghia X TURBO (rs 500 box)
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