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Joined: Jul 2012
Posts: 8
Grease Monkey
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Grease Monkey
Joined: Jul 2012
Posts: 8 |
Can anybody advise what the max clearance should be between the timing gear teeth on a 1928 car. Mine are noisy and I can get a 30 thou gauge between the teeth. Also, the crank gear is fibre, I thought this should be steel on a 28? The cam gear is 13/16 wide which is correct for year, anyone got any ideas. Also has anyone noticed the small hole (I assume breather) in upper surface of timing cover, it is in a stupid place as when removing bottom hose from water pump or when pump leaks it fills lower part of timing cover with water. Can this be blocked off or will this cause pressure.
Any advice would be most welcome
Many thanks Spokedwheel (UK)
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Joined: Oct 2009
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ChatMaster - 1,000
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ChatMaster - 1,000
Joined: Oct 2009
Posts: 1,294 |
Not sure about the 28,but my 37 the crank gear is steel and the cam gear is fibre. If I remember right clearance sould be around .002 to .005.I can say for sure .030 is to much.
Last edited by chevy1937; 07/01/12 03:39 PM.
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Joined: May 2002
Posts: 1,213
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: May 2002
Posts: 1,213 |
For a 1928 engine,the running clearance for the steel crankshaft gear to fibre camshaft gear is from zero backlash for new gears to 0.012",which is the factory recommendation clearance for replacement. 
CJP'S 29
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Joined: Jul 2012
Posts: 8
Grease Monkey
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Grease Monkey
Joined: Jul 2012
Posts: 8 |
Thanks for the info most helpful. Just need to find some new gears now.
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Joined: Dec 2001
Posts: 10,379 Likes: 1
Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
If your crank gear is fiber then you must be working on a 1927 engine? 
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Jul 2012
Posts: 8
Grease Monkey
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OP
Grease Monkey
Joined: Jul 2012
Posts: 8 |
Yes checked the part no on the gear and it seems in the past somebody has fitted earlier crank gear. Engine is a late 28 as 848532 and R4874150.
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Joined: Dec 2001
Posts: 10,379 Likes: 1
Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
You should change the crank gear to the metal one. The cam gear is fiber.
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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