R
Rich Sutherland
Guest
"My 41a (actually an AQAD4
"My 41a (actually an AQAD41A) would slowly overheat when running at higher rpms. After reading all the posts on this informative forum, I checked the intake, lines and pumps, then replaced the thermostats which helped a bit but it would still overheat over 3300 or so. I decided to pull the oil cooler and the heat exchanger off to rod them out. I found the problem, previous owner had bolted the heat exchangers big circular cover in wrong position and broken off 2 of the 3 separator fins and 20% of the tubes were clogged. Hopefully I can figure out where those fins go and the proper position for that cover.
My big problem is that when I tried to pull the cover off of the oil cooler 3 of the 4 bolts heads twisted off because of corrosion between the steel bolts in the aluminum housing. It also looks like there is a lot of corrosion on the back end where the copper core comes back though. I think that if I could get the tubed copper core out, I could heat the housing enough to get whats left of the stuck bolts out. I know if I heat it with the core in, it will melt the O ring.
So my questions are how does one take the oil cooler apart? I can't seem to get the copper core out.
How does one re-seal the back side?
If someone has a used oil cooler for a 41 in good shape, I'd sure be interested.
Here's a diagram of the oil cooler in question from the official Volvo US site:
http://www.volvopentastore.com/OIL_COOLER_838968/dm/view_id.326612--category_id. 333110--cart_id.102920845--session_id.164295346
Any assistance would be much appreciated."
"My 41a (actually an AQAD41A) would slowly overheat when running at higher rpms. After reading all the posts on this informative forum, I checked the intake, lines and pumps, then replaced the thermostats which helped a bit but it would still overheat over 3300 or so. I decided to pull the oil cooler and the heat exchanger off to rod them out. I found the problem, previous owner had bolted the heat exchangers big circular cover in wrong position and broken off 2 of the 3 separator fins and 20% of the tubes were clogged. Hopefully I can figure out where those fins go and the proper position for that cover.
My big problem is that when I tried to pull the cover off of the oil cooler 3 of the 4 bolts heads twisted off because of corrosion between the steel bolts in the aluminum housing. It also looks like there is a lot of corrosion on the back end where the copper core comes back though. I think that if I could get the tubed copper core out, I could heat the housing enough to get whats left of the stuck bolts out. I know if I heat it with the core in, it will melt the O ring.
So my questions are how does one take the oil cooler apart? I can't seem to get the copper core out.
How does one re-seal the back side?
If someone has a used oil cooler for a 41 in good shape, I'd sure be interested.
Here's a diagram of the oil cooler in question from the official Volvo US site:
http://www.volvopentastore.com/OIL_COOLER_838968/dm/view_id.326612--category_id. 333110--cart_id.102920845--session_id.164295346
Any assistance would be much appreciated."