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Joined: Oct 2003
Posts: 35
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Oct 2003
Posts: 35 |
Pulled the pan on my 1928 engine and the main bearings and crank journals are rough, even though the engine ran albeit some what nosy. The main and rod journals need to be either polished or ground under size. my questions are; do I polish to a suitable finish, minimal material removal, or grind the rods and mains to a standard under size? Are under size main bearings available or is there enough shim stock on the new bearings to accept the reduced journal diameters? Where can I buy replacement main bearings?
jwp
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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 |
Did the rods and mains have any shims left? Try that solution first.  
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: Oct 2003
Posts: 35
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Oct 2003
Posts: 35 |
The mains Plastigage at .003 without shims. The rods have two shims per side that are .060 each,.120 per side. The shims look solid and I have tryed to seperate using and x-acto knive with negitive results. The mains look pitted and have wear marks that corispond to marks on the journals. The rod bearings look good but shim adjustment is questionable.
jwp
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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 |
I think you are looking at spacers rather than .06 shims. Sounds like all the shims have been removed already.
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: Oct 2003
Posts: 35
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Oct 2003
Posts: 35 |
Are main bearings available? In standard our under sizes?
jwp
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Joined: Nov 2001
Posts: 19,758 Likes: 64
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 64 |
If your bearings are pitted, either they are getting brittle or acid has attacked them. In both cases I would suggest getting your shells rebabbited and then line bore them to proper size with 4 0.002" shims per side. There are a few places that do quality work and some I don't trust. Who you select depends upon where you live.
If in doubt about a shop talk to the local Model T or Model A guys. Their engines also have babbit bearings.
How Sweet the roar of a Chevy four!
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Joined: Oct 2003
Posts: 35
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Oct 2003
Posts: 35 |
I have found a local shop to do the work, but cost is high. Thanks for your inputs, JWP.
jwp
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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 |
How high was the quote? You can send to me by PM if you like.
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: Oct 2003
Posts: 35
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Oct 2003
Posts: 35 |
$200.00 grind crank, mains only. $145.00 each main includes line boring.
jwp
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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 |
$635.00 to "lay" a crank, kinda takes your breath away. Thanks for the info. You have just convinced me that I am in the wrong occupation.
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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