Well, I found out my problem and it ain't good. I had a mechanic come by the house and do some diagnosing and found I had number 3 and number 6 cylinders had no compression. I got out my air compresser and he ran air thru the 3 and 6 spark plug holes on at a time and air blew thru the carb. According to him this means the the intake valves on those cylinders are stuck open.
So, we pulled off the heads and checked the springs, they were good, but after they were totally off you could see that the valves were being sucked in. The heads are at a good machine shop, (they rebuilt my Onan 3kw and stand by their work) not the one that rebuilt the motors. Theres only about 61 hrs. on these motors and my mech. said it looks like he used used parts, as the valves were 2 different brands and didn't look good. Also the head gaskets looked like they were for a car. I didn't know there was a difference. Of course the rebuilder is no longer around so I can't confront him. So I should have the heads back in a week with correct gaskets and I'll let you guys know how it goes. In the meantime can anyone reccomend a good product to clean the antifreeze and smell out of my bilge? :)) Have a good weekend, Trace 1984 32' SS, Miss Nessy - Soon to be for sale as we want to move up to a larger boat Hernando Beach, Fl. On Sat, Jan 22, 2011 at 2:12 AM, waterguy <[email protected]> wrote: > I wonder if you're running lean at cruise speed (wouldn't be affected > by messing with the mixture screws, those only fine-tune the idle > mixture). A lean mixture would run rough, backfire, and burn plugs -- > as well as pistons -- do make sure you figure out your issue before > that happens! > > Have you changed carburetion in any way in connection with your major > rebuild? Any change to the camshaft or intake manifolding? If you > changed cam or manifold to where you're moving more air through > without rejetting your carb to match, that could be the problem. > > -- > You received this message because you are subscribed to the Google Groups > "UnifliteWorld" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<unifliteworld%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/unifliteworld?hl=en. > > -- You received this message because you are subscribed to the Google Groups "UnifliteWorld" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/unifliteworld?hl=en.
