225 Slant Six marine, water in engine

Author Message   Mac Townsend Visitor Posted on Saturday, June 02, 2007 - 10:40 pm:    Need help with an old Chrysler Slant 6-Volvo installation, specifically cooling. My grandson was given a '69 Silver Line with a 225 slant six running a Volvo outdrive. His first mistake was taking it and his second was trying to get it running again.<G> He found and bought a new exhaust manifold, the old one was cracked. We rebuilt the engine (#2 rod bearing had spun). It coughed into life again yesterday, ran in the cam for 30 min at 2,000 rpm then set out to refine the timing and idle. The service manual spec'd 550 rpm for idle speed. He reset it to that and within minutes the crankcase was water-oil mix, "milk". My grandson seems to think the water flows thru open exhaust valves into the cylinders and then past the rings into the sump. And that the solution is to get it timed just right. Well, the cam (a regrind on the old core) is timed to the crank just as it was when we pulled it. (yes, it was getting water in the oil before, but we thought it was because it had sat for years and had the water pump hooked up "goofy"--it is now hooked up according to the diagram in the book. But it seems to me wrong that the design of the system would allow water into the exhaust port and onto the back of the valve and into the combustion chamber. Can anyone speak with specific knowledge of this new-40-year-old lashup? We've been unable to find anyone locally (SF Bay Area -- NorthEast).   Fastjeff Senior Member Username: fastjeff Post Number: 3526 Registered: 09-2003 Posted on Sunday, June 03, 2007 - 11:52 am:    I hate to break it to you, but the block/ head is surely cracked. Better do a compression test first, to see if it's a head gasket (but I doubt it), then start looking for another slanter. Sorry, Jeff   mac townsend Visitor Posted on Monday, June 04, 2007 - 10:16 pm:    My grandson is being told that "boats are like this"--i.e. they get water in the oil if the timing isn't right or something else isn't set right. Further, this is a 40 year old design and I can assume design philosophy changes(?) I "think" the head was checked when the valves were done...the bill was certainly large enough! I know the block was not. Head gasket is new and it runs really nice so I don't think there's a compression loss (but that doesn't mean there's no water-oil port connection). I'm going to suggest pulling the exhaust manifold and running water into it thru the water ports and seeing if any comes out the exhaust ports that mate to the engine. Is this apt to be diagnostic? I mean, water SHOULD NOT come out the port to the head, right? All i know about is cars, and i cannot conceive of a connection to put water into the cylinder under any kind of setting problem...especially when the engine is running pretty well.   will c Visitor Posted on Tuesday, June 05, 2007 - 01:02 pm:    I think the only reason water would go into the exhaust valves was if the exhaust manifold was bad usually the water and ex gas don mix until after the elbow. so in short cam timing should not do that I would do a comp check and see what it yields. will   mac townsend Visitor Posted on Tuesday, June 05, 2007 - 09:46 pm:    Compression is tits. The problem diagnosed so far is with the home-made elbow and the water feed at the back of the manifold. It seems water feed back there comes in at an angle rather than straight down and a bit forward of the down "hole" resulting in "splash" (for lack of a better word) where some of the influent ends up back into the manifold where vacuum from not-quite-closed valves seems to draw it into the cylinder. loosening the exhaust valves a couple thou to ensure they are closed during the entire "suck" cycle also helps. doing this they've put another 30 min on the engine w/o water infiltration. Redirecting the inlet at that point directly down, rather than at an angle looks to be the answer. Instead of using a pipe elbow (rounded corner) we may have a 90-degree elbow welded up and drill it for a more direct shot into "the hole" This also squares with what the guy they bought the manifold from told them (which I didn't know about a couple days ago).   chester blachford Visitor Posted on Sunday, May 04, 2008 - 03:51 am:    Firstly is the engine mounted on a 30 degree angle and second have you had the water jackets tested?

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