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Cattle Boards
Trucks, Tractors & Machinery
Chevy 8.1 Vortec Rebuild
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<blockquote data-quote="Nesikep" data-source="post: 1129587" data-attributes="member: 9096"><p>I would agree with chevyTahoe as well, a compression test is the first thing it needs, you can do it yourself pretty easily with a guage available at any auto supply store... Cylinders should not deviate more than 10% of each other, and should be somewhere in the 120-180 psi range, dependent on engine design, and your altitude and temperature as well. If some or all seem low, squirt a little oil in each one and retest, if the readings are much better, that points to the rings being worn and it will need a rebuild, if it doesn't improve much, it's either a head gasket or bad valves. At that point, you can decide if you want to have someone take the heads off with the engine in the truck, which isn't too hard to do, and then you can see the condition of the cylinders and decide if the complete rebuild is worth to do then.</p><p></p><p>Does the truck smoke? If it smokes when it starts, then clears up, that is probably valve seals, if it smokes under deceleration, that's more likely to be rings.</p><p></p><p>From what I understand, you could just get a 'top end' job done on it.. rings and heads, unless it rattles and clunks the bottom end is probably fine...</p></blockquote><p></p>
[QUOTE="Nesikep, post: 1129587, member: 9096"] I would agree with chevyTahoe as well, a compression test is the first thing it needs, you can do it yourself pretty easily with a guage available at any auto supply store... Cylinders should not deviate more than 10% of each other, and should be somewhere in the 120-180 psi range, dependent on engine design, and your altitude and temperature as well. If some or all seem low, squirt a little oil in each one and retest, if the readings are much better, that points to the rings being worn and it will need a rebuild, if it doesn't improve much, it's either a head gasket or bad valves. At that point, you can decide if you want to have someone take the heads off with the engine in the truck, which isn't too hard to do, and then you can see the condition of the cylinders and decide if the complete rebuild is worth to do then. Does the truck smoke? If it smokes when it starts, then clears up, that is probably valve seals, if it smokes under deceleration, that's more likely to be rings. From what I understand, you could just get a 'top end' job done on it.. rings and heads, unless it rattles and clunks the bottom end is probably fine... [/QUOTE]
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Chevy 8.1 Vortec Rebuild
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