What is a typical main bearing clearance specification?
The factory specs include 2.450-inch main bearing journals and 2.100-inch rod journals, which means the target bearing clearance should be about 0.0024-inch (0.0025 is the common spec) on main bearings and 0.0021-inch on the rod bearings.
What is main bearing clearance?
The clearance measurement of the main bearing determines the amount of wear down the bearing has been subjected to. The clearance of the bearings will depend on the size of the engine but for a 900mm bore engine the clearance is between 0.40 and 0.70 mm with a maximum allowable of 0.9mm.
How is main bearing clearance calculated?
The commonly accepted rule that most crankshaft manufacturers prefer for street and performance engines is 0.0010-inch for every 1-inch of journal diameter. So for a 2.45-inch small-block main journal, the bearing clearance would be 0.0024-inch.
How do I know what size main bearings I need?
How much clearance do you need between bearing and shaft?
For instance, internal radial clearance of a deep-groove ball bearing mounted on a solid steel shaft with an interference fit of 0.013 mm (0.0005 in.) may be reduced as much as 0.010 mm (0.0004 in.)
What are the torque specs on a small block Chevy?
Small Block Chevy Torque Specs
| Fastener Type | Torque Spec |
|---|---|
| 7/16 in. Inner Main Cap Bolt | 70 ft.-lbs. |
| 3/8 in. Outer Main Cap Bolt | 40 ft.-lbs. |
| 11/32 in. Connecting Rod Bolt | 38-44 ft.-lbs. |
| 3/8 in. Connecting Rod Bolt | 40-45 ft,-lbs. |
What should the main bearing cap bolts be torqued to?
Main bearing cap bolts are torqued in third values – meaning they are torqued to one-third their full torque valve, then another third, then the full amount, which is 60 to 70 ft-lbs. Crankshaft end-play should be .004 to .008 inch, checked with a dial-indicator (not shown here).
What are the main bearing and Conrod tightening torque settings?
Re: Main Bearing and conrod tightening torque settings… Here is a link that has a manual with all the specs. Manuals and free owners instruction… Search through 700 000 manuals… You can’t post conmments that contain an email address. 1999. Why doesn’t it shift into gears or park while driving? Lags when pressing gas pedal
How are the bearings installed on a small block Ford?
Main bearings are lubricated with engine assembly lube and the caps installed as shown. Hand-tighten each cap, then snug with a socket wrench until the cap seats with the block. The rear main cap (number-5) is carefully seated in place.
How much torque do you need for PTFE bearings?
Standard torque requirement of PTFE type bearings is 0.049~1.96N · m {0.5~20kgf · cm}, which is relatively high comparing with ball bearings. Although it is possible to manufacture PTFE type bearings with 0.02N · m {0.2kgf · cm} or less torque, it should allow approx. 0.05mm play as well.