[Healeys] oil pressure relief valve

[Oudesluys]

  The oil gauge oscillating may depends on the design of the oil pump. 
If there is a slight variation in the output pressure you may see some 
vibration at low revs. Another source of a vibrating gauge may be the 
pressure relief valve "chattering". Even considerable play in a single 
rod bearing may cause it at low revs.
Kees Oudesluijs
NL

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