Logo
FULL SITE MENU

Compression aq125a volvo

N

new_boat_owner

Member
Hi does anyone know what the c

Hi does anyone know what the compression should be for an 1985 bayliner 2.1 liter aq125A ? I did a compression test and i'm getting around 120 with all the sparkplugs out. Thank you
 
"Should I be conccered with

"Should I be conccered with the 120 psi ? Also I did a compression check because I can not get my boat started! Its getting spark,fuel, and air. Any Ideas why it wont start ? Do I have to start it to winterize it ? I need to do it vary because its getting cold in Michigan.. Thanks"
 
"One thing that some people do

"One thing that some people don't realize is that if they use a pressure gauge connected to a relatively large flex hose, the compression readigs will be somewhat distorted. This is beacuse the engine is now compressing air not just into the combustion chamber, but also inside the volume of the hose. Nevertheless, if the engine has been running well until now and you have not experienced any loss of power or blow-by gases coming from the crankcase, you may be OK for the time being. Once thing you may want to do is to conduct a leakdown test to see if there is loss of compression through exhaust valves, in which case the engine will need a head job. And of course, if there are leaks going into the crankcase, that means the engine needs to be rebuilt or replaced.

Regarding the engine not starting, it could be due to wrong distributor timing; or also due to wrong valve timing (timing belt jumping one tooth or more). You may want to check those two items."
 
The engine has been running s

The engine has been running slower I really did not know why I thought maby it needed a tune up! How do you do leakdown test ? Also how do you check to see if timing belt jumped Timing marks on the crank & cam line up ? I'm sorry if I dont know much about engines I'm new at this.. Thanks for all the help..
 
"My guess is that your timimg

"My guess is that your timimg belt jumped. The reason I think this is because your engine won't start, and your compression numbers are on the low side. Check the condition of the gears and the tensioner, and definitely replace the belt.

Have a great day,

Rob."
 
I bought a timing belt today a

I bought a timing belt today and I'm going to replace it in the next couple of days! Any tricks on putting a new belt on ? Does any one know where I can buy a new tensioner? Thanks
 
"I would just but it from an a

"I would just but it from an autoparts store. Check your timing belt gears to make sure they are not corroded or it will destroy the belt and jump again. Remove the corrosion or buy new gears from a junkyard.

Have a great day,

Rob."
 
Back
Top