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Joined: May 2020
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Grease Monkey
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Grease Monkey
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I acquired an engine from a fella who died before he could finish his project. When I pulled the head #3 cylinder had grooves cut on both sides ( front and back). Any idea why they are there or what for? Compression gas would just blow by. I would add a pic but don’t know how. Thanks Tim
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Joined: Dec 2007
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ChatMaster - 4,000
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ChatMaster - 4,000
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I wonder if the wrist pin is loose in the piston. It could move back and forth and dig into the cylinder wall at the front and rear.
Rusty
VCCA #44680
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Joined: May 2020
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Grease Monkey
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Grease Monkey
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It looks like that could be it, The pin was tight when I pulled the piston, but maybe the other fella tightened it. It will have to be sleeved for sure. Appreciate the reply.
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Joined: Dec 2001
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Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
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Your wrist pin was seized and caused the damage. You can have the cylinder sleeved and march on. Be sure and fit the wrist pin correctly when you reassembly.
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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ChatMaster - 7,000
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ChatMaster - 7,000
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I believe the wrist pin should remain tight to the connecting rod. if it's the same as the 6 cylinder. The damage occurs when it becomes loose and moves front to back while running against the cylinder walls and causes deep grooves requiring the block to be sleeved.
Steve D
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Joined: Dec 2001
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Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
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: May 2020
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Grease Monkey
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Grease Monkey
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Thanks to you all. It will be sleeved.
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Just make sure that when you get the cylinders sleeved,that the machinist stops the bore for the sleeve about 1" from the bottom.This way,once the sleeve is fitted,machined etc,there's no possibility for it to move,as it's "held" from moving in the block by the "stop" at the bottom and the cylinder head at the top when you assemble the engine.A mate had his '24 Dodge 4cyl engine sleeved with the sleeve bores running right through,and every single sleeve moved destroying the block.Just a thought.
CJP'S 29
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Joined: May 2002
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ChatMaster - 6,000
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My local machine shop uses sleeves with a machined lip at the top. He bores suitable recess at the top of the bore and fits the sleeve down hard to the recess then takes a light skim accross the top so the sleeves are then flush with the top of the block. I have watched the process a couple of times.
Tony
1938 1/2 ton Hope to drive it before I retire
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That is a neat way to sleeve and lock it into place.
Rusty
VCCA #44680
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ChatMaster - 6,000
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It means there is continuous material top to bottom rather than the possibility of a lip wearing to cause problems. Depending on the original setup he wont do Alloy blocks as the different expansion rates of alloy and steel they often wont stay in place, while some dont stay in place from the original casting.
Tony
1938 1/2 ton Hope to drive it before I retire
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