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Last Post 02/28/2006 5:10 PM by  TeamFRD
Hewland Mk8 Differential help request
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TeamFRD
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12/07/2005 7:10 PM
    How scary is it to tear into a hewland diff? My symptoms: Last autocross (long ago) the car exited the course with the transaxle clunking every revolution. I could duplicate this at home. With axles off, each side will turn completely one at a time. But if both turn the same direction, they come to a point where there is great resistence. Turning both 359 degrees the opposite way yields the same stoppage.

    I have the the transaxle up on the bench now. Looking thru the center drain plug, it appears the side gear is missing a tooth. The tooth area is not jagged; it's just gone. Could that piece be wedged in somewhere causing the stopage? FYI: the gear is now on the 'left' since the center drain is now up. This upside down from normal installation in a FSV.

    I have the 'manual' - 17 pgs from Hewland.com/ it's weak. Is this job best left for a Pro or can a novice attempt? Any war stories?

    TeamFRD
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    12/07/2005 10:36 PM
    I could not wait! Took off the left side per manual. On it's inside it's stamped RH. Anyway - Both side gears have a missing tooth. Half of one was stuck in the gunk on the bottom. The other is wedged between the diff and the ring gear. The manual calls the ring gear the crown wheel. The cause of the clunk! The ring gear has some nicks mostly on the side that does not meet the pinion. The spyder gears look OK.

    Took off right side - stamped LH. Side plate and diff assembly are now out.


    Sat 12/10
    I've determined that I need 2 side gears and 1 spider gear and 2 dished washers for the spider gears. Shopping for Hewland part #s 2146, 2144, 2143.
    RFN026
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    01/03/2006 1:57 PM

    Am I correct that the large drain plug goes on top, and the RH and LH sides are actually reversed? What side does the ring gear go on? If you're facing the front of the car.

     

    Richard

    TeamFRD
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    01/06/2006 11:23 AM
    My installation (and normal for air cooled FSV) is the center drain is on the bottom. On my workbench I flipped over to correspond to the manual's diagram. (Someone with a FF must have wrote it.)

    After not looking at this for 2 weeks, I think the ring or 'crown' gear came from the left side when installed in a FSV. If I would not have flipped it over, the side plate stampings LH RH on the inside are correct. Waiting on parts to arrive from DRE/SR Racing... To answer my first questions - it was not too bad. While cleaning the diff. and crown - keep saying " Don't drop $500 part, don't drop $500 part"

    TeamFRD
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    02/28/2006 5:10 PM
    Parts installed, all back together. Took FTD at Buccanear Region #2. I'm baaaacckkk!
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