I picked up a bunch of timing gears

[Deleted User]

I got a bunch of NOS timing gears and I am trying to figure out which years they go to. I know they are not the early ones (34-?) they are wider there are a bunch of Cloyes ones with PN 967 on the box. They are wider than the 34 gear too. Also a Rambler gear in there which was interesting. Any ideas are they like 37-47 or 48 and up? Mark

super651

ra4jumb, would you take pictures of the gears please. I need one for a 48-56 Hudson 6 cylinder. Thanks so much.

[Deleted User]

super651, the Cloyes gear numbers for what you are needing is S-232 for the camshaft and S-231 for the crankshaft.

Geoff

'34-'36 were narrower. '37-40 are the same, then from '41 onwards they look similar, but the pitch is different ( 20 deg. against 14 formerly). You can tell by looking at them, the 14 degree ones have teeth that appear more towards vertical, with wider teeth at top and groove at bottom. They changed the pitch to make them stronger, with more material at the base of teeth. I don't have details of different manufacturers numbers. Technically, the '48 -'56 did not use gears, they had sprockets.

[Deleted User]

The numbers on them are as follows Hoof 304-56, D&B B3200, Perfection 944, Cloyes 967A. The 967s and at least one other have a westinghouse number on them 1032055 and say hudson on them. Here are some pictures, they are a bit dark sorry.

Park_W

Geoff et al, for some reason it's widely thought that the "wider" camshaft gears started in '37. That is incorrect . . . the change came in '36.

super651

Thanks Hudzilla, for the part numbers. Hudsonly Rudy

Geoff

Park, you are of course correct, and I knew that already. Mental block!
Geoff

bob ward

For those that know these details, what are the different timing gear widths, and do they need different timing covers?

Geoff

Further to my error, I had in mind that the '37 models were the first to feature the re-designed "big-port" exhaust hence my pis-post. The '36 model was a one-off year, with a mix of old and new features. It still had the same small exhaust ports and inlet manifold as the '34-'35 models, but had the "ironing board" cylinder head, water pump on the block, and wide timing gears.
To answer Bob, the '32-'35 gears are 7/8" wide, and the later ones all one inch. You don't need to change the timing cover, just fit a thicker gasket. The crank gears are also wider from '36 on. You have to use matched pairs of gears if replacing with '41 and later type of 20 deg. pitch. If using an alloy gear, these kits came with countersunk engine plate screws, and it was recommended that you drill the countersunk in the engine plate and use these screws. However, you can get away with taking the spring washer out from the existing bolts and shaving the thickness by half. The alloy gears have spokes cast in them, and these collide with the bolt heads. Another alternative is to machine metal off these spoke on the rear side to clear the bolts. If the thrust washer is missing the problem is exacerbated.

bob ward

Thanks Geoff. I've just had a look at my H8 which I believe is a 35, and there is 1/4" clearance between the timing cover and the harmonic balancer.

Out of curiosity, did Hudson do something to the front pulley and/or crankshaft to maintain that 1/4" clearance when the deeper timing gears were introduced in 36 or did they just tolerate the reduced (presumably 1/8") clearance?

Geoff

The thickness of the hub of the gear was unaltered. The teeth of the wider gears were offset by 1/16" each side. I'm a little confused about that engine, it looks like a '36, but the engine number says it is a '35.
Geoff