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volvo penta 4.3 vortec water in oil

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Old 10-13-2017, 07:05 AM
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Where is this drain for the intake manifold located.
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Old 10-13-2017, 11:00 AM
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Located in the very front but off center a hair more starboard position. Its actually the exact same as a drain plug you put in the transom. Some are silver and some are brass but of course painted from the OEM - Volvo was dark grey and Merc of course Phantom Black.

You have to lower the nose of the boat to get it to drain completely. They hold water.

In late mid half 1996 we got one of the first Newer V 6 models - 190 hp - the one piece curved down exhaust manifolds ( no exhaust risers ) - with a 2 bbl carb - vortec and that drain plug in the intake manifold. Mercruiser. So looking over this engine in detail - seen a hull drain plug in the intake manifold. -

Marine service shops prob about 70 % in 1996 and about 50 % in 1997 ended up with cracked intakes basically because not to many knew about this especially the Volvo dealers. Volvo has less service training classes than Mercruiser and less training locations as well back then.

I will admit I / my shops got lucky finding this in Sept 1996. Cause if I did not we would have been in the same boat as the 70 % whom did not know about the V6 intake drain plug. .
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Last edited by BUP; 10-13-2017 at 11:04 AM.
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Old 10-13-2017, 11:18 AM
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OEM stock Volvo exhaust manifolds - more times when deep freeze break -- crack external - a huge chunk will crack. The thinnest casting section in those manifolds are the external side wall of the manifold one of the reasons they crack externally from froze broke. I am not saying they will never leak internally from what ever reasons but passing along the info. .
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