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Overheating VolvoPenta AQ131275

J

John Howard

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" My 1987 Galaxie with Volvo-P

" My 1987 Galaxie with Volvo-Penta AQ131/275 is overheating. The first time it overheated - I was pulling some skiers, and the temp guage suddenly started climbing (210+). I have since changed the thermostat and it is still overheating. What other obvious things should I check before I let a dealer/shop check it out ? Thanks for any info. "
 
" Locate your supply hose that

" Locate your supply hose that feeds your water pump on the engine and make sure plenty of water is reaching engine. Is the boat an open cooling system?, or is it a closed cooling system? If it's an open system I would definately check the impeller in the sterndrive. "
 
" Hi JH as you know the raw wa

" Hi JH as you know the raw water impeller is on the engine not in the stern drive. Sometimes the inlet hose from the stern drive to the transom plate developes a bubble internally and you can't see it, the bubble restricts the inside diameter of the hose and also the water flow. If the manifold gets hot while under load(be careful of personal injury when checking a running engine, watch out for the belts!!!)then there is a lack of external cooling water getting to the engine. Check the impeller and water flow into the raw water pump. A clogged manifold (more common in salt water) can also cause high manifold temp. Testing the manifold for high water pressure can answer this question. If you are in salt water where mussels grow, a mussel shell can block the water passage in the outdrive where the outlet nipple attaches. This is a tough problem to solve, it usually involves separating the stern drive to clean it properly. Also check the Oring between the two halves of the outdrive.
Keep us posted. "
 
" Just passing through, but I

" Just passing through, but I noticed your problem.
Look for the elbow where the cooling water is diverted from the drive into the engine. about a third of the way down, at the back). It corrodes after a few years and starts to leak.

When the boat is idle, or at displacement speeds, it's below the waterline and the engine doesn't overheat.

When you're on plane, it rises above the waterline and starts to suck air. Your engine overheats quite badly.

It took my boatyard three years to locate the problem (they aren't Volvo specialists).

Hope this helps "
 
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