MECHANIC JOE

Bay of Plenty Times, Volume LXXII, Issue 13430, 18 April 1944, Page 3

MECHANIC JOE

ANSWERS OWNERS'

t PROBLEMS |LOW OIL. PRESSURE Q: I liave recently purchased a 10 h.p. 1937 Talbot tourer (engine No. 1934). It has done 25,900 miles, and appears to he perfect mechanically except for a marked drop in oil pressure when the engine is hot. What should

the oil pressure he and can you advise me regarding the possible defect?—"S. J. V."

A: -The oil pressure reading should be 301 b at 30-40 m.p.h., with the engine at normal running tem-

perature. You do not state to what extent the oil pressure drops when the engine is hot. The following are the most probable reasons for the loss of pressure. 1. Defective oil relief valve, weakness of the spring tension, foreign matter between the ball and seating, or, alternatively, a damaged seating. This relief valve can be dealt with externally, and should present no difficulty.

cause inefficiency and low pressure. 3. Slackness of bearings.—After a considerable mileage, wear takes place, of course, in the main and big-end bearings and the crankshaft journals, and from the symptoms described it would appear that this is probably the cause of the low pressure on your car. Rectification will obviously mean removal of the sump and an examination being carried out. If excessive slackness is

2. Inefficient oil pump.—The oil found, the most satisfactory method pump is of the usual gear type, and Q f dealing with the matter is usually wear on the gears or excessive found to be the fitting of a recondiclearance between the gears and the tioned crankshaft, together with face of the pump will naturally suitable undersize bearings.