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Old 11-05-2013, 10:58 AM   #1
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Question water pressure

hi , I want to fit a water pressure gauge to a 90hp Yamaha, does any one know where the small male brass fitting that came with the kit screws in to the block to take the tubing.............thanks!
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Old 11-05-2013, 05:24 PM   #2
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Sadly, I don't know the answer, but I have like the same question for my V6 2.6 200hp, so I'm following this thread
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Old 11-05-2013, 06:35 PM   #3
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W/P Plug

Hi , Unscrew the plug (90340-14M00-00) located between the top and middle cylinder on the cylinder head on the left , not on the cover. The plug has an orange fibre seal ( 90430-14115-00 ) , although will probably been painted over from the factory. Does look like a fixing bolt , but is indeed a plug ! 14mm hex i think.
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Old 11-05-2013, 07:12 PM   #4
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Quote:
Originally Posted by gap52 View Post
Hi , Unscrew the plug (90340-14M00-00) located between the top and middle cylinder on the cylinder head on the left , not on the cover. The plug has an orange fibre seal ( 90430-14115-00 ) , although will probably been painted over from the factory. Does look like a fixing bolt , but is indeed a plug ! 14mm hex i think.
hi...thank for your reply.
have taken bolt out but seems blank sealed space once bolt removed, no access to water jacket of block for pipe to get pressure to work the gauge ,plus the fitting that came with the kit is tiny, any ideas .
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Old 11-05-2013, 08:16 PM   #5
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W/P Plug

Drilling for a Temp switch sender then. My model was a 90aetol 2stroke.
2001. Will look out pictures on Monday if not sorted by then.
Have seen that plug drilled to accept a hose tail for pipe. If fitting smaller , is there a plug in the water jacket cover on exhaust side ? My plug definately had
water flow behind it.
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Old 11-05-2013, 08:20 PM   #6
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W/P Plug

Another thought. Does it tee into the tell tale hose perhaps.
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Old 11-05-2013, 08:29 PM   #7
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W/P Plug

Not the only one !

http://www.yamahaoutboardparts.com/f...t-th19558.html
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Old 11-05-2013, 08:55 PM   #8
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Quote:
Originally Posted by gap52 View Post
Drilling for a Temp switch sender then. My model was a 90aetol 2stroke.
2001. Will look out pictures on Monday if not sorted by then.
Have seen that plug drilled to accept a hose tail for pipe. If fitting smaller , is there a plug in the water jacket cover on exhaust side ? My plug definately had
water flow behind it.
thanks, it 1990 model picture would be a great help
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Old 12-05-2013, 02:38 PM   #9
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Quote:
Originally Posted by gap52 View Post
Hi , Unscrew the plug (90340-14M00-00) located between the top and middle cylinder on the cylinder head on the left , not on the cover. The plug has an orange fibre seal ( 90430-14115-00 ) , although will probably been painted over from the factory. Does look like a fixing bolt , but is indeed a plug ! 14mm hex i think.
you are right when I looked carefully there is a small opening in to the water jacket with the bolt/plug removed so thank you for your advise and have found part number for adapter...MAR-WPRES-AD-TR...to fit tubing too.
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Old 12-05-2013, 06:37 PM   #10
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More Info

Found original instructions , also includes V engines ( Toffy ) and took a picture for you ! Hope your now sorted.
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Old 12-05-2013, 07:32 PM   #11
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Quote:
Originally Posted by gap52 View Post
Found original instructions , also includes V engines ( Toffy ) and took a picture for you ! Hope your now sorted.
your a star thanks for your help the pic, instructions have the Yamaha part number to adapt the small brass fitting I have so will order tomorrow....job done!..thanks again
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Old 12-05-2013, 08:26 PM   #12
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absolutely great info !! thanks guys
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Old 13-05-2013, 03:17 PM   #13
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Quote:
Originally Posted by gap52 View Post
Found original instructions , also includes V engines ( Toffy ) and took a picture for you ! Hope your now sorted.
Same procedure for a Yamaha 150 90-93'?
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