The thermo pellet
located in the front of the eccentric shaft is prone to failure. When it
does fail, it fails in a mode where oil is bypassed and oil pressure drops - the
only hint of this failure is maybe a 10-20psi drop in normal oil pressure.
The oil thermo pellet is designed to bypass oil until the oil heats
up. When it gets hot enough, the wax melts and a pin at the end of the
thermowax pellet extends. In this extended position, the thermowax plugs a
bypass oil passage. With the bypass oil passage plugged up, the oil then
flows through the normal oil passages.
A cheap way to prevent this
problem is to shim the oil thermo pellet with a bunch of M7 (7mm, metric)
washers. Use at least five M7 washers to shim the oil thermo pellet to a
minimum spec of 6.5mm.
Click here for Oil Thermo Bypass Pellet shim procedure!
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