Re: oil pump 2.4L
There have been three oil pumps used on the 2.3L Quad 4. The oil pump was bolted to the block and driven by a helical gear on the crank until ’95 when it became part of the balancer assembly and was driven by the secondary balance shaft. The original pump that was used in ’87 and part of ’88 (it’s called "first design ’88" according to GM) is no longer serviced by GM or the aftermarket. So, the revised pump that was introduced as "second design ’88" is the only one that’s available for the earlier engines. This creates a problem, because the early oil pan and fill tube will not work with the "second design" oil pump, so they both have to be replaced with the later pan and tube (for about $150) when the "second design" pump is installed.
The oil pumps are easy to tell apart because the "first design" pump has an aluminum gear cover with the pickup tube bolted to the pump while the "second design" pump has a one-piece, crimped metal cover combined with the pickup tube.
Starting in 1995, the gerorotor oil pump was housed in a two-piece, split aluminum housing that was bolted on the back corner of the balancer assembly. The oil is picked up through a screen (p/n 24573826) that covers the oil passage that’s located in the middle of the balancer assembly.
The ’96 oil pump appears to be similar to the ’95 version, but it has a new part number. GM had problems with excessive oil pressure caused by the relief valve sticking in the bore, so the original pump was superseded with a new version that had improved clearance for the relief valve. hope this helps
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11-03-2007, 10:45 AM
