Checking Connecting Rod Alignment With Squaring Plate

If rod proves to be out of alignment, it can be straightened by means of a bar inserted through piston pin, as shown in Illus. 71. Use bar of largest diameter that can be inserted through pin.

The manner in which piston seats on squaring plate indicates as follows:

1. Piston high on same side, both crank pin positions; rod is bent.

2. Piston high on opposite sides as crank pin position is changed; rod is twisted.

3. Piston sguare or nearly square with crank pin in one position and high on one side with crank pin in other position; rod is bent and twisted.

4. To straighten a bent rod, insert straightening bar through piston pin hole on low side of piston and apply upward force.

5. To straighten a twisted rod, insert straightening bar through piston pin hole on high side of piston, and if crank pin position is to front apply force to rear—if crank pin position is to rear apply force to front.

6. To straighten a bent and twisted rod (combination of a bend and twist) remove bend first and then remove twist. See above paragraphs, Nos. 4 and 5.

After rods have been aligned check to see that pistons center in crankcase cylinder opening, without side pressure on upper rod ends. If further realigning is necessary to center pistons, correct by one of the following methods: Dress off end of rod upper bushing (on interfering side) with a file; install a different combination of thrust collars (9) and (25), Illus. 62 or 63, to shift flywheel and rod assembly sideways.

Installing Cylinders (O.H.V. Engine)

Lubricate cylinder walls, pistons, pins and rod upper bushings generously with engine oil. Also pour about V* pint of oil onto rod lower ends. This is an initial crankcase supply to take care of lubrication requirements while oiling system is building up normal pressure and circulation, directly after starting an overhauled engine the first time.

Space ring gaps about equidistant around piston.

Turn engine until crank pin is at bottom center. See that crankcases are clean and install cylinder base gaskets. Cylinders can now be installed over pistons and rings being careful not to change ring gap location. Work cylinders carefully down over rings to avoid any possibility of ring breakage. Install rear cylinder first. Install lock washers and turn on cylinder base nuts and pull them down just snug, not tight. (This is to allow for alignment of intake manifold when installed.) Follow same procedure with front cylinder.

Attaching Carburetor to Manifold

After servicing carburetor as needed according to information under "Servicing Carburetor," Page 120, attach it to manifold with two heavy (asbestos) gas-

DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

Get My Free Ebook


  • asmait
    How to straighten harley connecting rod?
    6 years ago
  • Jana
    How to check a connecting rod for misalignment?
    5 years ago
  • Haben
    How to straighten a bent harley connecting rod?
    5 years ago
  • charles
    How to check connecting rod alignment?
    2 years ago
  • cino
    How to apply connecting rod aligner?
    2 years ago

Post a comment