750RK (Seca)

Crankshaft, Con rods and Bearings -- Inspection and Repair

Submitted by xjcdadmin on Thu, 04/23/2009 - 15:15

I. Crankshaft

1. Crankshaft run-out

Support the crankshaft at both ends on V-blocks. Measure the amount of crankshaft run-out on the main bearing journals with a dial gauge while rotating crankshaft.

Run-out limit: 0.040 mm (0.0016 in!

If run-out exceeds limit, replace crankshaft.

2. Inspection of bearings

Pistons and Cylinder Reassembly

Submitted by xjcdadmin on Thu, 04/23/2009 - 15:15

11. Pistons and Cylinder a. Install the pistons on the rods. The arrow on the piston must point to the front of the engine.

NOTE:

Before installing the piston pin clips, cover the crankcase with a clean rag so you will not accidentally drop the circlip into the crankcase. Always install new piston pin circlips.

Cylinder Head and Valves -- Inspection & Repair

Submitted by xjcdadmin on Thu, 04/23/2009 - 15:15

INSPECTION AND REPAIR

A.   Cylinder Head Cover

Place head cover on a surface plate. There should be no warpage. Correct by re-surfacing as follows:

Place #400 or #600 grit wet sandpaper on surface plate and re-surface head cover using a figure-eight sanding pattern. Rotate head cover several times to avoid removing too much material from one side.

Electrical Maintenance

Submitted by xjcdadmin on Thu, 04/23/2009 - 15:15

ELECTRICAL

A. Battery

1. The fluid level should be between the upper and lower level marks. Use only distilled water if refilling is necessary.

CAUTION:

Normal tap water contains minerals which are harmful to a battery; therefore, refill only with distilled water.