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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

'89 Dodge Spirit, No Oil Pressure

Q: My name is Damon and I have recently rebuilt an’89 Dodge Spirit (2.5 liter engine) that we originally bought new. I rebuilt the engine including a new water pump, oil pump, etc. When I started the car it started easily and ran smoothly but showed no oil pressure. The lifters chattered fiercely and I shut the engine off. I removed the oil sending unit and started the engine. No oil came through the oil sending unit opening (hole in block). Therefore, I removed the oil pan and oil pump from the engine and put the oil pump in a pan of oil and turned the shaft by hand and oil came out the oil hole - the pump was working. Still no oil pressure to the engine. While the engine was worked on at a machine shop, I was told to leave off a balance shaft carrier in the oil pan. I was also instructed to block the oil flow to that unit. The machinist told me that this unit cannot be replaced.

A: I’d say that you’re missing an oil gallery plug inside the engine. The oil gallery is a maze of passages that provide oil to all the critical lube points of the engine. Because of all the direction changes in the engine the passages have to be drilled/machined from different angles. To close the unneeded side of this machine work, a plug is installed. These plugs are removed when rebuilding an engine to allow for proper cleaning. If a plug is forgotten during assembly there will be little to no oil pressure. It sounds as if you’re going back into the engine to find a passage that is missing a plug.

 
     
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