LOW COMPRESSION

[imported_sharkin95]

I HAVE A 4.3 LX 1995 I JUST COMPLETED INSTALLING NEW HEAD GASKETS,INTAKE AND EXHAUST MANIFOLD GASKETS,I INCORRECTLY ADJUSTED THE VALVES AND WAS GETTING A STEADY 10-12 HG ON THE VAC GAUGE.I DID A WARM COMPRESSION TEST AND GOT ON 1-3-5 CYLS 140 LBS AND ON 2-4-6 130-140FT LBS, THE MERC BOOK SAYS IT SHOULD BE 180LBS.MY QUESTION IS IF THE VALVES AREN'T ADJUSTED CORRECTLY WILL THAT HAVE AN EFFECT ON THE LOW COMPRESSION READINGS.

 

[Richard Petersen]

Re: LOW COMPRESSION

What are the readings after you adjusted them correctly?

 

[Don S]

Re: LOW COMPRESSION

Why are you yelling at us??? (aka using all caps)<br /><br />Re-adjust the valves (Per the Merc manual), and take another compression test per this bulletin. Follow all the steps, and you WILL know the condition of your engine.<br /><br /> http://www.boatfix.com/merc/Bullet/97/97_25.pdf

 

[imported_sharkin95]

Re: LOW COMPRESSION

thanks for the reply, it seems the bulletin answered my question.<br /><br />c. valves leaking :compression low on the first stroke.I will re-due the valves and the test tommorrow.and post the results.

 

[imported_sharkin95]

Re: LOW COMPRESSION

well re-adjusted the valves to merc manual #18.vacuume reading came up to 17hg.did a warm compression test and got on 1-3-5- 150-150-160 and on 2-4-6- 135-125-150.squirted oil in 2 & 4 compression came up to 170lbs in both.

 

[Bondo]

Re: LOW COMPRESSION

It Sounds like You're All Ready to Go Boating Now.................<br /><br />That motor has Plenty of Time left in it.......<br /><br />Have Fun............

 

[imported_sharkin95]

Re: LOW COMPRESSION

thanks bondo,I figured it was within merc specs of 70% from the highest reading.I'll keep an eye on the oil pressure.