GOOD NEWS. . . . The PICTURE UPLOAD FUNCTION IS WORKING !!! The tech folks at the parent company have been able to remedy the issue. You can upload pictures once again. Thank you for your patience.
Can anyone tell me what the compression readings should be on a 1996 Johnson Ocean Runner 150HP 60deg looper? I right about 90 on all 6 cylinders. It is good that they are all close, but is 90 low?
It depends on a lot of things; You want to have the engine warm and well lubricated, and have all the spark plugs out when you do the test. You need to use a good screw-in tester. The battery needs to be fully charged so that you are cranking fast.
90psi is not low on a 60* looper. Sometimes I feel like a broken record. . ."it is the spread that matters . . .click. . .it is the spread that matters. . . it is". . .etc.
This was the first time doing this test myself and I was unsure of the procedure. I did not remove all plugs when testing - removed one at a time. Engine was cold, but battery was fresh. Would this skew the results?
