Damage to Con rod by gear shaft

HP engines (Hirtenberger, AG Austria) tech support. Owned by RJL Industries since 1990

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Damage to Con rod by gear shaft

Postby Ted Hatton » Thu Feb 14, 2008 5:44 pm

I read that one of your readers had problems with the gear shaft moving forward and causing damage to the rod. I had the same problem with a VT49 purchased 'NIB'. I put it down to incorrect assembly, replaced the rod , made sure the securing strap was really tight and carried on.
Unfortunately the problem reoccurred very quickly.
You suggest that the trouble is caused by excessive drag on the valve, due to valve damage or incorrect shimming. The valve is definitely OK
so the prob could be the shim?? How do I check the correct clearance for the valve and what should it be? The engine is fitted with the roller bearing on the valve.
Yours Hopefully Ted Hatton Matakana N.Z.
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Location: Matakana New Zealand

Postby MECOA » Fri Feb 29, 2008 9:51 pm

Once this happens it is hard to correct. Incorrect glow plug also causes drag on the valve. I would suggest using silver solder on the strap to pin.

The shim just keeps the rod from moving back against the main bevel gear.
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