Merc/CMI service bulletin
03-30-2011, 08:54 PM
#12
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Where can we get the parts?
Is this mod needed or is it just for installation of the new headers and tailpipes? The service bulletin does not say that all older set-ups should have this mod done. My headers have always stayed cool. When I stop the boat and check the engine room one thing I do is see if I can hold my hand on each header tube.
And here is a link to where that bulletin was posted since I'm sure not everyone saw it.
http://www.offshoreonly.com/forums/3360439-post36.html
Is this mod needed or is it just for installation of the new headers and tailpipes? The service bulletin does not say that all older set-ups should have this mod done. My headers have always stayed cool. When I stop the boat and check the engine room one thing I do is see if I can hold my hand on each header tube.
And here is a link to where that bulletin was posted since I'm sure not everyone saw it.
http://www.offshoreonly.com/forums/3360439-post36.html
03-30-2011, 09:46 PM
#13
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OK but I'll still have to order two .406" upper restrictors since both uppers must now be the same. The starboard side are smaller now.
Last edited by thirdchildhood; 03-30-2011 at 09:49 PM.
03-31-2011, 07:33 AM
#14
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03-31-2011, 07:37 AM
#15
Gold Member
Gold MemberThread Starter
If so, would'nt that eliminate the blue thumb screw at the end? I like having them to drain the headers. I have them on the front of the rail too but I prefer to use the rear. When I pull the front plug on the port side I have to deflect the stream of water so it doesn't pour on to the alternator.
Last edited by Dave M; 03-31-2011 at 07:40 AM.
03-31-2011, 07:48 AM
#17
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iTrader: (6)
The diagram I posted indicates that there are restrictors on each side of the jumper hose but no big deal since I can just drill them/it out 
.
I'm still not sure I will do the mod. My headers run cool and I don't want to increase the chance of reversion if I don't have to. I'll run it by my mechanic.
. I'm still not sure I will do the mod. My headers run cool and I don't want to increase the chance of reversion if I don't have to. I'll run it by my mechanic.
03-31-2011, 08:12 AM
#18
Gold Member
Gold MemberThread Starter
To do this the merc way you need
(1) 22-842453406
(2) 22-32803
(2) 22-8M0022059
Replace the restrictor on the top side of the starboard tail with the .406 (22-842453406). Port side is already .406
Replace restrictors on the bottom side of the tails with a plug (both sides). (22-32803)
Replace the fitting on the header rail (Both sides) (22-8M0022059)
04-01-2011, 07:58 AM
#20
Registered
Are you just capping off the part of the header rail fitting that the bypass hose connects too? Or replacing that entire fitting with a plug?
If so, would'nt that eliminate the blue thumb screw at the end? I like having them to drain the headers. I have them on the front of the rail too but I prefer to use the rear. When I pull the front plug on the port side I have to deflect the stream of water so it doesn't pour on to the alternator.
If so, would'nt that eliminate the blue thumb screw at the end? I like having them to drain the headers. I have them on the front of the rail too but I prefer to use the rear. When I pull the front plug on the port side I have to deflect the stream of water so it doesn't pour on to the alternator.
I bought all the fittings on my 370 from ACE to convert. I guess I need the ported plugs changed?
