Johnnydeep
Cadet
- Joined
- Nov 8, 2004
- Messages
- 13
I have a 1989 FWC 131d in a 2150 bayliner. when we first got the boat a couple of years ago it used water. Needles to say I eventually got to replace the head gasket! Since then it has leaked a bit of water out of the cap. as this year wore on the drip became a dribble became a stream and of course on this engine a stream from the heat exchanger cap runs right onto the distributer. I deduced that the heat exchanger core must be leaking and pulled everything down, pressure tested the core(insert) and found several pinholes that I solderd up, pressure tested it to about 35psi...no leaks . Back together and guess what...still makes water. Have had it apart several times since and I have learned a couple of things about its behaviour. 1) it will only make water at higher rpm and in the water. Will not do it in the driveway even at 5000 rpm. ( I am assuming the exhast backpressure is what is causing the Raw water to be forced into the cooling system) 2) if I troll all day I get very little water out of the cap(see #1) 3)The insert sits in the tank aganst a piece of rubber(chaffe protection) with a hole for the inlet and outlet tubes. The rubber looks as if the water is blowing past it and is bubbled back into the tank. I find it hard to beleive that this rubber is a seal and that the inlet and outlet seals would fail that way unless they were cracked( just thought of this!!)....i even rtv'd the crappola out of these... 4) I know beyond a doubt that it is raw waterpushing the coolant out...We are in the salt alot and I have salt in the motor....(BAD!!!)<br /> Now for th part that troubles me the most. I ran the boat last in lake washington about a month ago. Same problems, brought the boat back and parked it, went to mexico etc etc. (longest the boat has sat in 2 years)went out last night to dig back in and the heat exchanger tank was empty. Now I will assume that the core is still my problem and that the coolant just drained out the exhaust side(impeller would stop it on the other side right?)and onto the ground. After all I did find a dead rat next to the boat trailer a couple of weeks ago!! The only catch to that is that the coolant was right up to spec with the orange stuff and I did not run it long enough to dilute it down and when I drained the exhast manifold through the drain petcock I got clear stinky lake water...no trace of coolant.<br /><br />Couple of more things. The oil is fine, nice and clean and uses about a teaspoon between changes(fuel pump gasket weeps a bit), The only coolant in the bilge comes out the cap. We use the hell out of this thing, 300+ hours a year, and ther is no oil in the water!!!<br /><br />I hate to throw a new insert at it without ahving anybetter ideas ($300 to $560, have not been able to find a used one) <br /><br />Help...am I going in the right direction here <br />Sorry for the long post