Dear Don,
I just purchased a rebuild engine from Moyer Marine, and it's about to be installed in my 1972 Pearson 30. Upon further reflection, this may be a good time to rebuild the exhaust system, although the current one seems to be operating fine. It looks like the original installation, which makes it over 30 years old. The manifold is connected to a double-wall jacketed exhaust pipe, which in turn is connected to a vertical copper riser, then to a rubber exhaust hose. I've read that the inner wall of the exhaust pipe can develop cracks, which in turn can allow raw water to back up into the engine. This sure would be a dreadful thing to do to a newly rebult engine!
Any recommendations you can give me would be much appreciated. I was going to put together the hot section from brass, starting with your (OVCM_04_127) exhaust flange, then your (CSOT_01.2_334) T-type cooling water exhaust entry fitting, configured as shown in the catalog, although I will have to use a 45° elbow on the tail pipe to take the exhaust to the starbord side, where the current riser is located. Not much room.
Then a new lifter, probably stainless steel - any recommendations? The connection between the exhaust pipe and lifter will probably have to be a short section of rubber hose.
Are you familiar with the original installations on the Pearson 30's? Any recommendations?
Would it be possible by any chance to get somewhere a new double-wall jacketed exhaust pipe, i.e., just like the original installation?
Right now the raw water exits at the rear or the double-wall jacketed exhaust pipe and is connected via 1/2" rubber hose to the top of the riser. I'm guessing the raw water is injected into the exhaust proper on the downslope after the riser - thus the riser itself is dry?
Or should I just forget about the original system and replace it with a completely new one put together from modern components?
Best regards
John
I just purchased a rebuild engine from Moyer Marine, and it's about to be installed in my 1972 Pearson 30. Upon further reflection, this may be a good time to rebuild the exhaust system, although the current one seems to be operating fine. It looks like the original installation, which makes it over 30 years old. The manifold is connected to a double-wall jacketed exhaust pipe, which in turn is connected to a vertical copper riser, then to a rubber exhaust hose. I've read that the inner wall of the exhaust pipe can develop cracks, which in turn can allow raw water to back up into the engine. This sure would be a dreadful thing to do to a newly rebult engine!
Any recommendations you can give me would be much appreciated. I was going to put together the hot section from brass, starting with your (OVCM_04_127) exhaust flange, then your (CSOT_01.2_334) T-type cooling water exhaust entry fitting, configured as shown in the catalog, although I will have to use a 45° elbow on the tail pipe to take the exhaust to the starbord side, where the current riser is located. Not much room.
Then a new lifter, probably stainless steel - any recommendations? The connection between the exhaust pipe and lifter will probably have to be a short section of rubber hose.
Are you familiar with the original installations on the Pearson 30's? Any recommendations?
Would it be possible by any chance to get somewhere a new double-wall jacketed exhaust pipe, i.e., just like the original installation?
Right now the raw water exits at the rear or the double-wall jacketed exhaust pipe and is connected via 1/2" rubber hose to the top of the riser. I'm guessing the raw water is injected into the exhaust proper on the downslope after the riser - thus the riser itself is dry?
Or should I just forget about the original system and replace it with a completely new one put together from modern components?
Best regards
John
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