Have a slippery weekend boys
For those of you running a thicker oil viscosity in you 5.7 Hemi, see clearances for the Cam and bearings below. For those of you running a ?w40 weight oil in the 5.7 4th Gen Hemi, think again!
Chrysler Material Standard MS-6395 CAMSHAFT SPECIFICATIONS DESCRIPTION / SPECIFICATION 5.7 4th Gen Hemi. Recommended Engine Oil - MOPAR API Certified SAE 5W-20 engine oil.
Bearing To Journal Clearance Standard - No. 1 / .0015 - .003 in.
Bearing To Journal Clearance Standard - No. 2 / .0019 - .0035 in.
Bearing To Journal Clearance Standard - No. 3 / .0015 - .003 in.
Bearing To Journal Clearance Standard - No. 4 / .0019 - .0035 in.
Bearing To Journal Clearance Standard - No. 5 / .0015 - .003 in.
Average width of a Human Hair = 0.001 – 0.005 in.
Note: Clearances are per Chrysler.
WHY IS THIS IMPORTANT? Because internal engine components are cooled by oil “Directly” and cooled by the coolant “Indirectly”. So running a thicker oil than what is recommended is a bad idea in most cases. Because oil “flow” through internal engine clearances is critical for proper lubrication and to pull heat from internal engine components. The engine oil temperature in these areas of the engine can be 50-90 degrees “Hotter” than oil sump temperatures; thinner oils flow better than thicker oils pulling more heat from internal engine components.