1977 26' Formula, twin 454's, MercTrans II, TRS drives. Raw water cooled.
It's plumbed pretty much like an inboard (thru hull pickup, belt driver pumps).
Port engine, rubber exhaust hose (about 12" long) from the riser/elbow to the y pipe is cookin, 200 +. on the top section of hose .The engine is cool, manifold and riser/elbow are cool, This engine had the t-stat housing with 6 nipples , 2 to bottom of manifold, 2 to top of manifold, 2 to riser/elbow. I replaced that with the newer kind, 4 nipples, ran 2 to bottom off manifold and 2 to the Elbow. The starboard engine has this t-stat housing, but with 2 hoses to the TOP of the manifold and 2 to the elbow. Rebuilt the raw rater pump and replaced Manifold and elbow. this week. Still have the problem.
I appreciate any suggestions or questions.
Larry
It's plumbed pretty much like an inboard (thru hull pickup, belt driver pumps).
Port engine, rubber exhaust hose (about 12" long) from the riser/elbow to the y pipe is cookin, 200 +. on the top section of hose .The engine is cool, manifold and riser/elbow are cool, This engine had the t-stat housing with 6 nipples , 2 to bottom of manifold, 2 to top of manifold, 2 to riser/elbow. I replaced that with the newer kind, 4 nipples, ran 2 to bottom off manifold and 2 to the Elbow. The starboard engine has this t-stat housing, but with 2 hoses to the TOP of the manifold and 2 to the elbow. Rebuilt the raw rater pump and replaced Manifold and elbow. this week. Still have the problem.
I appreciate any suggestions or questions.
Larry