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Cummins 4BT Coolant leak
Posted to HD/Fleet Forum on 1/31/2013 2 Replies

Hi All,

We have a vehicle in our shop with a Cummins 3.9L 4BT engine (it is installed in a Toyota Landcruiser!) It had a medium sized oil leak from the oil filter adapter plate to oil cooler. We disassembled and replaced the two gaskets with OE Cummins parts. Now there is a coolant leak between the oil cooler and the block. So we took it apart and did it a second time, same problem. Cooler plate is flat and straight. Any advice? Goop it up with RTV does not seem like a good idea.



Gary Siegel
San Francisco Auto Repair Center Inc.
San Francisco, California, USA

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