Camshaft install tips and tricks
(→Cleaning) |
(→Pre-lube) |
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'''3. Failure to properly massage an extreme pressure lubricant such as molybdenum disulphide into the pores of the metal on all lobes and lifter faces.''' | '''3. Failure to properly massage an extreme pressure lubricant such as molybdenum disulphide into the pores of the metal on all lobes and lifter faces.''' | ||
| − | Molybdenum disulphide will actually bond with the metal and give maximum protection to the lifter crown/lobe. | + | Molybdenum disulphide will actually bond with the metal and give maximum protection to the lifter crown/lobe. Use the 'moly' lube on the distributor gear, cam lobes and the lifter foot that contacts the lobe only- '''not''' the bearing journals. |
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'''4. Failure to use an extreme pressure lubricant additive in the engine oil for camshaft break-in.''' | '''4. Failure to use an extreme pressure lubricant additive in the engine oil for camshaft break-in.''' | ||
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'''7. Failure to check for retainer to valve guide/seal clearance.''' | '''7. Failure to check for retainer to valve guide/seal clearance.''' | ||
| − | 1/16"-1/8" clearance at full valve lift is considered sufficient. This is the limiting lift factor with the stock L31 Vortec heads. Most uninformed people will say they can run a 0.500" lift cam with them stock. That leaves ZERO clearance between the retainer and the seal. Not good. GM says the limit is about 0.420" with the stock pieces. GM engineers say 0.420" lift allows 0.030" retainer-to-seal clearance. | + | 1/16"-1/8" clearance at full valve lift is considered sufficient. This is the limiting lift factor with the stock L31 Vortec heads. Most uninformed people will say they can run a 0.500" lift cam with them stock. That leaves ZERO clearance between the retainer and the seal. Not good. GM says the limit is about 0.420" with the stock pieces. GM engineers say 0.420" lift allows 0.030" retainer-to-seal clearance. |
| − | + | ||
===Checking clearances=== | ===Checking clearances=== | ||
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