mercruiser 260 riser gasket recommendations

[reefguy]

I just got to taking off the old exhaust riser due to a crack, but after detaching from the manifold i noticed the gasket that
were in place ; the metal gasket which has no slots for any water circulation, i have attached a picture of the metal gasket, without the regular gaskets which were taken off in little pieces, if you look at the manifold it has slots and so does the riser, the original who had it done at the shop, could they have mistakenly put a metal gasket without the slots for water flow thru? pls take a look at the pics and see if, i should buy the metal with slots(if avail) or leave it, which im very sure will stop water flow thru and possible raise my temp. in the exhaust, pls correct if i am incorrect. thanks.




im having problems loading the other pics for you guys to see, so basically i wanted to know if those 3 slots in the manifold to the riser should be blocked with the metal gasket without the slots or it should have the slots in it.

thanks

 

[alldodge]

Re: mercruiser 260 riser gasket recommendations

Not knowing what your serial number is I'm working from a 1978-82 260. That would be for the most part yes These 3 pics should show what the installation is.



There are two exhaust gaskets and one exhaust plate sandwiched between them

 

[Bt Doctur]

Re: mercruiser 260 riser gasket recommendations

It all depends on the therm. http://www.boatfix.com/merc/Techbk/97/97hga6.pdf
Serial number will lead you to the correct manual and here is a site that has them.http://boatinfo.no/lib/library.html

 

[reefguy]

Re: mercruiser 260 riser gasket recommendations

why is the metal gasket there, is blocks the 3 water passages ways to the riser and after time it corrodes badly, was this intended for a particular purpose?

 

[Bt Doctur]

Re: mercruiser 260 riser gasket recommendations

Like i said ,it all depends on the T housing and hose configuration.manifols can flow independant of riser flow.you need to tell us the engine serial number and type of cooling system.

 

[reefguy]

Re: mercruiser 260 riser gasket recommendations

im still doing best on working on the serial number, the cooling system is just raw seawater pump..

 

[Bt Doctur]

Re: mercruiser 260 riser gasket recommendations

They are log manifolds so try #2 or #3 to see what matches up.Boatinfo - The library, containing manuals, brochures and other technical documents from the last hundred years!

 

[reefguy]

Re: mercruiser 260 riser gasket recommendations

my manifolds and etc.. are in book #3, but the prints are so small and not so accurate, so i enlarge it makes it almost unreadable.

 

[Bt Doctur]

Re: mercruiser 260 riser gasket recommendations

So you need a copy of #3 ?

 

[Bt Doctur]

Re: mercruiser 260 riser gasket recommendations

http://www.boatfix.com/merc/Bullet/81/81_14.pdf

 

[reefguy]

Re: mercruiser 260 riser gasket recommendations

bt doc, yes i do need one.. but i am going to try to locate the starter and serial number.

 

[reefguy]

Re: mercruiser 260 riser gasket recommendations

I found the serial number today, it wasn't difficult at all, just followed the main battery lead to the starter and there she was. Now i can order the necessary.. thanks alot guys.

bt doctur, question for you.. Are those pages out of the service manuals?

 

[reefguy]

Re: mercruiser 260 riser gasket recommendations

any suggestions, which company is good to buy parts online?

 

[alldodge]

Re: mercruiser 260 riser gasket recommendations

iboats is a good company

 

[reefguy]

Re: mercruiser 260 riser gasket recommendations

thanks will check it out.

 

[PondDonzi]

Re: mercruiser 260 riser gasket recommendations

why is the metal gasket there, is blocks the 3 water passages ways to the riser and after time it corrodes badly, was this intended for a particular purpose?

Usually the closed plate means its for inboard/outboard, open plates are for inboard use, no stern drive.

 

[reefguy]

Re: mercruiser 260 riser gasket recommendations

thanks for the info. guys..

I know they need to be installed with some type of gasket maker sealant, using regular
automotive high temp gasket sealant okay for this job?