Re: Hi-torque mini starter
follow this :
Shimming Procedures
UNLIKE FORD AND CHRYSLER which have a fixed starter drive gear to flywheel clearance, GM starters have an ADJUSTABLE CLEARANCE.
IMPORTANT
Most of the causes of premature starter failure of GM pad-mounted starters are a result of improper shimming, regardless of whether the old starter had shims or not, you you must inspect the clearance of this new unit as it may or may not require shimming.
BEFORE INSTALLATION:
You must understand the need for proper starter pinion to flywheel clearance!
This "CLEARANCE" is critical to avoid damage to: Flywheel, Starter Drive, Battery
WHY SHIMMING VARIES?
1. Mounting pad tolerances and hole locations vary from block to block, this moves the starter drive gear away from the flywheel varying distances.
2. The mounting pad on the engine block dimensions vary. This also moves the starter drive gear away from the flywheel varying distances.
STEP 1: INSPECTION
Remove lower flywheel housing cover and examine the entire flywheel for visual problems: worn, chipped or broken teeth; bent flywheel and/or incorrectly cut teeth.
STEP 2: CHECKING CLEARANCE
Insert a screwdriver behind the starter drive. Move starter drive assembly out toward flywheel so that the starter pinion and ring gear teeth mesh.
STEP 3: MEASURING CLEARANCE
Center the pinion tooth. Check clearance (looking for .025" - .060"). A convenient plug gauge is a common paper clip, which typically mikes out at about .035". Important - Check at least 3 ring gear locations 120° apart for proper clearance. Shim as required at minimum clearance location. After measuring clearance, push starter drive back into original position. Step 4: Proper Shimming
To Increase Clearance: Use entire shim across both holes. .015" shim increases clearance approx. .0075". This moves the starter down and out, away from the flywheel (use no more than 6 shims).
To Decrease Clearance: Use 1/2 shim only on the outer mounting bolt hole from oil pan. This moves the starter in and toward the flywheel. .015" shim decreases clearance approx. .010".
[size=-1]Copyright ®1998 CVR Clay Valley Mfg. Inc.[/size]