Gear end clearance .004-.008 and check the cover for wear and flat. It can be surface ground to clean up.
Shim the drive gear to crank gear lash to .005-.010.
Look the set screws over closely that drive he shaft and driven gear. That is a weak point. Be sure the screws are tight, the gear is not split, or loose on the shaft.
Take the suction line and screen off and clean, clean, clean! Anything gets sucked into the pump will lock it and shear the set screw or split the gear!
While you are in there...
Be a good time to pull the cylinder liners and replace the orings, especially since it's been hot. If any liners rode up with the head off, they MUST be removed and resealed. Check the block for cracks between the cylinders at the bottom, common failure due to freezing. Clean thoroughly!!! Orings must seal, liners must bottom completely at the top flange. Liner height above block deck is CRITICAL,.001-.003.
Take a look at the governor. Early weighted style has been replaced with the ball type. Both are prone to fail, release pieces into the engine.
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