S3 with V8, clutch issues - Defender Source
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  #1  
Old July 30th, 2014, 04:51 PM
Roverlab
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Trevor Griffiths
85 110, 92 110, 92 RR, 06 LR3
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S3 with V8, clutch issues

Series 3 109 now has a small block chevy fitted. I've been tasked with tracing a noise from the clutch that only occurs when the car has been driven a little and everything is up to temperature. The noise is present the moment one lays any pressure on the clutch pedal and increases the noise the harder/further one presses on the pedal.
First thought is a failing throw out bearing but so did the customer who replaced the bearing recently for the exact same noise.
I have determined that there wasn't adequate free play at the pedal to the master push rod and figured that the clutch hydraulic fluid expanded from heat and caused some drag against the bearing, possibly contributing to the noise.
It is quiet if you are off of the pedal.

Tomorrow I am going to pull the slave cylinder and fit a shim between it's housing and the bell housing, like is normally found on a D90. (The oil filter has to come off to extract the cylinder, and dang, it's hot right there.)

Currently I can make the clutch slip with heavy throttle, and it's very possible that the lack of free play at the release bearing allows this to happen , or that the lack of free play wore out the new-ish disc, but my question for those that have fitted a SBC v8 to the Series transmission: is the stock Series Rover clutch good enough to handle the V8 power? I'd hate to take out the box and not fit adequate clutch parts!

I do not yet know if it's a 9", 9.5" or 10" clutch.
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  #2  
Old July 30th, 2014, 10:15 PM
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transientmechanic
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Adam
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Thank god the clutch is slipping. It's saving you from picking up transmission pieces from all over the ground.

Call Matthew Jackson at Advance Adapters and explain your predicament. He will be able to offer perspective. (He has a SBC in his Series IIA)
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Old July 30th, 2014, 10:46 PM
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Leslie Bright
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A Series transmission is marginal for the stock powerplant; definitely not up for a SBC.... It's a wonder it's still holding together....
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  #4  
Old July 31st, 2014, 03:20 PM
Roverlab
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Trevor Griffiths
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Don't know who's adapter is in their- I'm batting clean up!
Never thought of a clutch disc as a "fuse" to protect the gears.....
Matthew helped me out last year with a 4BT powered 109, very helpful....
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Old July 31st, 2014, 04:45 PM
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Robert Davis
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Years ago when I started looking at series engine conversions and worked at the USCG Aircraft repair and Supply center, the reliability engineer analyzed the series transmission (both IIA and III).
The report was you do not want to put over 190 ft lbs of torque through a series transmission and maintain reliability. The GM 350 V8 has to put out at least 290 ft lbs of torque.

I think the front transmission bearing on the primary pinion has failed and rattles when the clutch is depressed.
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Old July 31st, 2014, 05:14 PM
Roverlab
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Trevor Griffiths
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I don't hear any bearing noise "winding down" when the clutch pedal is depressed, like I would expect as the input shaft slows.
This morning, we fitted a spacer under the slave cylinder, drove the car the exact same way and duration as multiple previous test drives that consistently produced the noise, and it has not returned. No change in the ability to engage first gear at a stop. And, I would almost believe that the point in which the clutch begins to slip un-mercilessly is at a higher rpm/load. But, none of that changes the fact that the Series clutch likely was never intended to have this much torque and hp applied to it.
Waiting on a call back from the owner.....
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