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1954 HD9B Engine Clutch Rebuild


 
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Cariboo4x4
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PostPosted: Sun Dec 30, 2018 9:24 am    Post subject: 1954 HD9B Engine Clutch Rebuild Reply to specific post Reply with quote

So clutch pressure plate has lots of heat spots. I don't recall seeing cracks in pressure plate yet will look again. . Flywheel is covered in heat spots and radial cracks. Service Manual says we can remove 1/16" of material. I spoke to an ace machinist and he says he can resurface flywheel and possibly pressure plate. Clutch drive plate looks fine yet I'll measure it for thickness spec today. Neighbor says clutch would slip in 2nd gear. I'll post more photos later today or tomorrow,

When I have removed clutch pressure plates on regular trucks, I back off each bolt a 1/2 turn in a repeating star pattern so tension slowly releases. I did this and pressure plate did not come off. See photo. It wasn't until we pried pressure plate off with two opposing pry bars that pressure plate popped off. I been reading service manual and still trying to figure out how pressure plate assembly functions to put pressure on clutch disc. Heading out to shop today to see how it exerts pressure.

What part of clutch system causes the "over center snap" when moving hand clutch lever?

I wonder what the availability is on new, used, or refurbished parts?




 
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JOCCO
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PostPosted: Sun Dec 30, 2018 9:31 am    Post subject: Re: 1954 HD9B Engine Clutch Rebuild Reply to specific post Reply with quote

Not sure I am with your 100% but Resurfacing the metal is good. I would go with a new disc and I would be concerned with the springs in the plate. Willing to bet a clutch rebuilding place would not be to costly. Next I would check my manuals on set up, various measurements of the pieces as it can cause a new clutch to not work, throw out etc.
 
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Bob
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PostPosted: Sun Dec 30, 2018 11:59 am    Post subject: Re: 1954 HD9B Engine Clutch Rebuild Reply to specific post Reply with quote

"What part of clutch system causes the "over center snap" when moving hand clutch lever?"

The little "dogbone" linkages between the TO bearing and the pressure plate "overcenter" and create the "snap action".

The "toothed wheel" is the clutch adjustment, moving the pressure plate closer to the flywheel to compensate for wear, and keep the clutch snapping engaged properly.
 
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Cariboo4x4
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PostPosted: Sun Dec 30, 2018 1:48 pm    Post subject: Re: 1954 HD9B Engine Clutch Rebuild Reply to specific post Reply with quote

Thanks guys. After being out to shop today I took some photos:

Here is one photo of flywheel wear and tear.

2nd photo: I flipped pressure plate over and seen these cracks in pressure plate mechanism. As the pressure plate sits on work bench its is disengaged. I'm thinking as it is engaged these cracks are causing pressure plate to not fully grip clutch disc. Going to take it apart and see how it works.




 
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Cariboo4x4
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PostPosted: Mon Dec 31, 2018 8:49 am    Post subject: Re: 1954 HD9B Engine Clutch Rebuild Reply to specific post Reply with quote

I took clutch pressure plate assembly apart and Back Plate is cracked. There is a casting number on it CL-8303. I have a clutch place I can call in Vancouver BC, yet does anyone here know where I could find a good used back plate? I'm thinking it could be welded yet I'm thinking its a part that is under tension when clutch is engaged. Neighbor could only adjust hand clutch lever to 15 pounds on his spring scale so I'm thinking the Back Plate cracks were definitely part of the problem.


 
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Cariboo4x4
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PostPosted: Mon Jan 21, 2019 8:38 am    Post subject: Re: 1954 HD9B Engine Clutch Rebuild Reply to specific post Reply with quote


I located a good used part in Australia of all places. They describe themselves as the biggest dismantler in the southern hemisphere. So good used back plate is coming in as airmail.
Philhuntparts.com.au
 
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