Good day all, really need some help on this because I've never encountered something like this before? I'm working on a 2005 dodge Durango with the 3.7 engine. The engine was totally locked up so we had to do a complete rebuild. The crank, oil pump, main and connecting rod bearing were replaced; the driver side head (Left) was replaced. The block was honed out for new Pistons and rings. Everything was put back up by the book, so came the day to start this bad boy up and it started right up but ran rough, just to find out that the right (passenger) side of the engine had very LOW compression on cylinders 2,4& 6. 135 has 150psi and up.

The compression read was 60psi for cylinders 4&6 with cylinder 2 with only 30psi. I did a leak down test and found out that cylinder 4&6 had only 2 present leakage so why was the compression test so low, any ideas on what could be causing this low compression on only one side of the engine? Oh the head gaskets are new as well, with new oil and spark plugs. There are times it would have long cranking time until I take a sparkplug from any cylinder on the right head and it would start right up. Thanks for all the help

Michael Francis
Owner
Marvelous Rides
Nassau, Bahamas