compression question

[seacat69]

hi all,<br />I posted a topic yesterday re a dead piston on my 78 model 175 johnson. Now i would like to ask an opinion of you experts : )<br />the compression on the other 5 are 100 psi.....is this good or bad or ugly???<br />1: should i change the rings on the dead piston only as i really cant afford a rebuild at present.....and i had a sneak look today and there is some freeplay with the dead piston and the rear ring appears worn with scratches, i would assume 20psi if that.<br />2: can it still be run with one piston very low on compression until i decide what im going to do? or is this risky<br />3: it still starts and goes extremely well as is.<br />4: my last option...anyone want to buy a well maintained 5.5 seacat twin hull 2.5 beam <br />thanks for your input/help

 

[Droll]

Re: compression question

100 psi ,ok .<br />Most important part is the difference between the highest\lowest cylinder , should NOT excide 10% difference . <br /><br />1: Yes you could , but I would have changed the rings ( + hone cylinders ) on those other pistons too , you still have to bye a gasket kit + its the same amount of work .<br /><br />2: You could ,BUT it gets more expensive , today 1 piston/rings > tomorrow a new rod , maybe new crankshaft +++ , bearings . <br /><br />3: se above .<br /><br />4: