‘91 merc 60hp overheating alarm buzzing

[Evinrudej]

Most Mercury had ---NO HEAD GASKET----Until the V-6 came out.-----Inline 6 never used a head gasket.

Did my model have no head gasket?

 

[racerone]

Post serial # or check the parts book for your motor.

 

[Evinrudej]

Post serial # or check the parts book for your motor.

 

[Evinrudej]

it’s not looking like it has one just connected to block no head or am I wrong ?

 

[Evinrudej]

My service manual for 100 hp range 2 stroke Mercury's says to expect problems if compression is less than 120 PSI. You're close and it may be ok but the manual says what it says!

So I had a feeling my compression tester wasn’t reading correctly. Bought a new test and tested today
(after running for 5 mins)
Top- 126
Middle- 130
Bottom-125

 

[Chris1956]

Generally speaking, compression testers are often inaccurate. However, they are usually reliable. If all the cylinders read the same (within 15%), the compression is good. I think your numbers are just fine, despite what the manual says. Is that a Merc Service manual?

 

[Texasmark]

Generally speaking, compression testers are often inaccurate. However, they are usually reliable. If all the cylinders read the same (within 15%), the compression is good. I think your numbers are just fine, despite what the manual says. Is that a Merc Service manual?

Mine is.