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Question for Joe 175 V6 Johnson 1983

J

jdkline

Regular Contributor
I have a few questions about

I have a few questions about this engine. It has been sitting in my uncle's yard for the past few years and he's used it enough to keep it from setting up. The engine has less than 500 hours on it and seems in good condition. This is the non-VRO model with power tilt and trim. I have a chance to get this engine and just wonder about the specifications such as what the WOT operating range is and degree of the block. Is it loop charged or crossflow? Do you know if this engine hads any inherent design flaws or common problems? I know I am asking a lot without providing the model number. Just tell me as much as you can from what information I gave you. Thanks!
 
"JD.... It is a good design bu

"JD.... It is a good design but as you're aware, anything mechanical can develop problems. You'll just have to check it out. It's a crossflow engine with a 90° V/6 block.

Joe
"
 
" I wasn't asking for guar

" I wasn't asking for guarantees. Just your opinion which I respect. I will have my uncle check or scheck myself spark and compression. I'm assuming compression should be at least 100 psi and within 10% on all cylinders and I don't know if the spark should jump a 1/4" or 7/16" gap? It seems to be in really good shape, only problems have been minor. The major complaint being it's a gas hog. What could I expect it to burn? About 16-18 GPH at wide open? It's on an old 20' Crutchfield and that thing will fly in the low 50s at least with it. "
 
"JD.... Compression should be

"JD.... Compression should be approx 100+ psi and even. Spark should jump a 7/16" gap. Since it's been sitting, I'd assume the carburetors will need cleaning. I have no idea as to the fuel consumption.... that would vary with the condition of the boat, etc. All engines have a cruise setting, going to full throttle will set the carbs wide open and full advance spark, then reduce the throttle to approx 3/4 throttle. This keeps the spark at full spark advance but drops the carb butterflies way down, resulting in somewhat of a loss of power but not too much. But the fuel saving aspect is terrific.

This feature becomes clear by having the hood off (engine not running) and observing the linkages when going through that procedure.

Joe
"
 
" He's run it enough that

" He's run it enough that I don't think they've set up. What you said about avancing thh throttle to wide open and then backing it of to 3/4 or 1/2 is what I do with my 15 and what I'd do with any engine. I only run actual WOT occasionally when I get in a really big hurry or just want to make sure it's hitting the correct rpm range, etc. You didn't say if you knew what the WOT range on the 175 was. Thanks for the advice. "
 
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