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Prussian Blue Marking Compound

Prussian Blue Marking Compound

Your Price: $10.00
In Stock
CMC Part Number:9055
  • Qty:Sold Individually in .75 FL oz tubes

Part: Prussian Blue 

Why You Need This: Prussian Blue is a non drying marking compound used check the contact surface of  a valve face to valve seat when working on a cylinder head.  If you are replacing your valves with new ones or simply lapping and reinstalling the original valves on your Honda CB350 / CB360 / CB450 / CB550 engine, then Prussian Blue is needed to determine the proper fit and seal between the valve face and seat. Since it is impossible to see how well a valve and seat fit together after years of wear, Prussian Blue is applied evenly and thin around the valve face and pressed it into the matched seat to check the consistency of the face contact the two parts make. This is done pre-lapping to determine the initial state of the parts and post-lapping to see if the lapping process was successful.  

Sold as a .75 FL oz tube, one tube will do many valve jobs. 

Installation Tip:  If you are replacing your engine valves then they must be lapped to the old seats in the head. Apply a thin even coat of Prussian Blue to the valve face. Press the vale to the seat (do not rotate the valve during the checking process), remove and check the seat for contact (where the blue has transferred). Wipe clean and rotate the valve 90 degrees and test again, Repeat two more times to ensure the valve and seat are making good contact. Thin, spotty or incomplete contact means the valve seats will need additional lapping or cutting to bring back them back to true. Do not squeeze on the gel like toothpaste along the surface. 

NOTE: Valve guides must be within service limits before attempting a valve lap. If not replace valve guides first. 

This Prussian Blue Is Used On These Honda Motorcycles
19651966196719681969197019711972197319741975197619771978
450
500T
CB450K0CB450K0CB450K0CB450K1CB450K2CB450K3CB450K4CB450K5CB450K6CB450K7CB500TCB500T
CL450K0CL450K1CL450K2CL450K3CL450K4CL450K5CL450K5CL450K6
350CB350K0CB350K1CB350K2CB350K3CB350K4CB350K5
CL350K0CL350K1CL350K2CL350K3CL350K4CL350K5
SL350K0SL350K0SL350K1SL350K2SL350K2
360CB360GCB360TCB360T
CL360K0CL360K1CJ360TCJ360T
500F
550
CB500K0CB500K1CB500K2CB550K0CB550K1CB550KCB550KCB550K
CB550FCB550FCB550F

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