What should be an acceptable range on a 2000 150HP XR6 EFI? All are supposedly measuring 95psi. That sounded low to me. Anyone know if this is acceptable?
I believe that is at the low end of normal. Of greater concern is the variation between cylinders. If they are all at around 95psi, I think you are OK. There is a carbon deposit cleaner that may help if the rings are stuck; a possible explanation of the lower compression. Its a Mercury product. I suggest you go to BBC (BassBoatCentral) to their Mercury motor forum and search for the product and the process for its use. At the same site you will find the description for PROPER compression testing. Your numbers might be low because of a procedural error.
grybrd wrote:I believe that is at the low end of normal. Of greater concern is the variation between cylinders. If they are all at around 95psi, I think you are OK. There is a carbon deposit cleaner that may help if the rings are stuck; a possible explanation of the lower compression. Its a Mercury product. I suggest you go to BBC (BassBoatCentral) to their Mercury motor forum and search for the product and the process for its use. At the same site you will find the description for PROPER compression testing. Your numbers might be low because of a procedural error.Thats what I thought. The seller may not know how to check it properly. He did say they were all even however. I was thinking they should be 110-115psi.
If they are all within the 5 PSI range then your good. No scoring or broken parts would be indicated. Even if it is low on compression, which this one seems fine, then your alright if they are even. Just a weak engine is the indication. BCB
X2 on the leak down test. I have a 175hp XRI EFI I had one hole reading 95 and the rest between 100 and 110. My tec used the carbon deposit cleaner and once we got the engine running on all six cylinders things were good. leak down test was between 7% to 5% on all cylinders. Also did a compression check after just for the hell of it and the low reading cylinder was reading 105 all cylinders between 105 to 110. If I remember correctly our EFI engines were lower compression then a carb engine from the factory. Carbon build up can give you a lower reading try the cleaner and see what that does for you.
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