Mercruiser 454 riser gasket question
#1
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Mercruiser 454 riser gasket question
Hello
I have a newly acquired a boat and I am going through it doing some maintenance. I removed the exhaust manifolds and risers and I have a question about what is the correct gasket to be using between the manifolds and the risers. The engine has a heat exchanger half kit, so there is raw water going into the manifolds as well as the risers. It is all OEM Mercruiser Horizon parts I believe. I would like to know whether the partially blocked off gasket is used in this application, or if the fully open four hole gasket should be used. I have included links to the two gaskets below. The gaskets that came out of it were the fully open, four hole type. The gaskets that came in my kit are the partially blocked off type.
Thanks in advance for the advice.
http://www.mercruiserparts.com/863724-gasket
http://www.mercruiserparts.com/863726-gasket
I have a newly acquired a boat and I am going through it doing some maintenance. I removed the exhaust manifolds and risers and I have a question about what is the correct gasket to be using between the manifolds and the risers. The engine has a heat exchanger half kit, so there is raw water going into the manifolds as well as the risers. It is all OEM Mercruiser Horizon parts I believe. I would like to know whether the partially blocked off gasket is used in this application, or if the fully open four hole gasket should be used. I have included links to the two gaskets below. The gaskets that came out of it were the fully open, four hole type. The gaskets that came in my kit are the partially blocked off type.
Thanks in advance for the advice.
http://www.mercruiserparts.com/863724-gasket
http://www.mercruiserparts.com/863726-gasket
#4
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you need to post your engine serial number and year model and 100 % which app do you have ? MCM or MIE and is this a Horizon 4 sure - if so they were used for inboard apps. so is this what you have a inboard app ? You have closed cooling as you mentioned correct ? Do you have extension blocks between the risers and manifolds ? Is this a stock app 4 sure ? if NOT what do you have ?
What kit did you buy and are installing ? New manifolds and risers ? If so what brand ?
Whithout this info its a possible guess.
What kit did you buy and are installing ? New manifolds and risers ? If so what brand ?
Whithout this info its a possible guess.
Last edited by BUP; 04-03-2016 at 11:17 AM.
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BUP
It is a Sterndrive. For sure Horizon, it is marked on the top of the intake manifold. Yes it is heat exchanged with the half system. The kit is just a Sierra Exhaust gasket set for big blocks. No spacers, just the OEM manifolds and risers. I am replacing the risers only with new OEM parts.
ENG: 0M000134 465202HN1 MERCRUISER 454 MAG BRAVO MPI Horizon
DRV: 0M117798 5231200N1 MERCRUISER BRAVO 1 1.50:1
TRN: 0L897586 6311001N1 MERCRUISER BRAVO MAG TRAN
Date of manufacture 07/20/2000
It is a Sterndrive. For sure Horizon, it is marked on the top of the intake manifold. Yes it is heat exchanged with the half system. The kit is just a Sierra Exhaust gasket set for big blocks. No spacers, just the OEM manifolds and risers. I am replacing the risers only with new OEM parts.
ENG: 0M000134 465202HN1 MERCRUISER 454 MAG BRAVO MPI Horizon
DRV: 0M117798 5231200N1 MERCRUISER BRAVO 1 1.50:1
TRN: 0L897586 6311001N1 MERCRUISER BRAVO MAG TRAN
Date of manufacture 07/20/2000
#9
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replacing risers? get a couple of these. http://www.ebay.com/itm/MERCRUISER-5...dW1jFm&vxp=mtr