258 Main and connecting rod bearings
- Posts
- 348
- Thanks
- 8
- Location
- Mt. Cheaha, AL
- Vehicle(s)
- '84 CJ7, 258, T4, D300, D30, AMC20, 3.54 gears
First is it a fools errand to think new lower end bearings with new oil pump will solve hot idle pressure of 12-15psi?
Second FSM states factory bearings are color coded- anyone that can vouch the color is still present after 35yrs. No markings on the block to indicate over/under sized crank or cam. I can mic crank somewhat in place to confirm.
Already confirmed good dry compression 145-150psi and I know at least the the rear main had some scoring from seal replacement last summer journal surface was smooth though. Running 60psi cold idle with 10w-40 and quart of STP blue.
Hot cruising 35-40psi but 800rpm hot idle with cold outside temps 12-15psi.
Water temps running 160 right now 185 in summer- oil viscosity and pressure are only going to get worse.
Plan on doing it engine in and changing timing chain while while I’m at it.
Sent from my iPhone using Tapatalk
Second FSM states factory bearings are color coded- anyone that can vouch the color is still present after 35yrs. No markings on the block to indicate over/under sized crank or cam. I can mic crank somewhat in place to confirm.
Already confirmed good dry compression 145-150psi and I know at least the the rear main had some scoring from seal replacement last summer journal surface was smooth though. Running 60psi cold idle with 10w-40 and quart of STP blue.
Hot cruising 35-40psi but 800rpm hot idle with cold outside temps 12-15psi.
Water temps running 160 right now 185 in summer- oil viscosity and pressure are only going to get worse.
Plan on doing it engine in and changing timing chain while while I’m at it.
Sent from my iPhone using Tapatalk