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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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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 users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  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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