82 mercruiser model 485 radiator hose blown

8

82merc485

Cadet
Joined
May 10, 2012
Messages
6
I Have a 82 mercruiser model 485. Did a complete gasket over haul from the head up. Got it running good in the driveway. So I took it to the lake to really try it out. It ran great for 5min them antifreeze started gushing out of the radiator cap and then a hose blew that goes from the Intake to the exhaust manifold. Any answer why it would blow. Would there b an air pocket or something else.
 
S

stonyloam

Vice Admiral
Joined
Mar 13, 2009
Messages
5,827
Re: 82 mercruiser model 485 radiator hose blown

Did you retorque the head bolts?
 
8

82merc485

Cadet
Joined
May 10, 2012
Messages
6
Re: 82 mercruiser model 485 radiator hose blown

No I didn't. I thought I needed to run a little longer before I retorqued the head bolts
 
S

stonyloam

Vice Admiral
Joined
Mar 13, 2009
Messages
5,827
Re: 82 mercruiser model 485 radiator hose blown

It only needs to be run up to operating temp, in the driveway would do. That may be your problem. Need to do a compression test, and check for coolant in the oil, if there get it out asap. Good luck.
 
8

89sandman

Seaman
Joined
Jun 1, 2012
Messages
55
Re: 82 mercruiser model 485 radiator hose blown

did you have the head magnafluxed and surfaced? do a compression test if you still have a problem it should show up in one or 2 cylinders being low on compression... sounds like compression from one or more of the cylinders leaking into the cooling system.
 
You must log in or register to reply here.
Top