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15-03-2015, 09:21 PM
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#1
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Registered User
Location: Sarisbury Green
Occupation: Electrician
Interests: Racing
Boat make: Ring 34
Engines: Mercruisers
Cruising area: Solent
Join Date: Dec 2009
Location: Sarisbury Green
Posts: 415
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Mercury Powerhead Identification
Can anyone help identify this power head?
Thanks
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16-03-2015, 12:17 AM
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#2
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Senior Member
Country: UK
Location: Devon
Occupation: Garage Proprietor
Interests: PowerBoat Racing
Boat name: If Only
Boat make: Bernico F3 OCR, Bernico Prototype Inboard, and some Ribs
Engines: Yamaha Pro V 115
Cruising area: UK, France
Join Date: Jan 2005
Location: Devon
Posts: 3,095
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Looks like XR2 ! Serial number should tell you !
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If Only
National Outboard Immersed Propeller Mono Record 103mph
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16-03-2015, 12:42 AM
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#3
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,803
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Don't think so, never seen an XR2 with oil pump drilled, or that coil arrangement. Should have alodine on block not raw. I'd say warranty exchange/ replaced block and heads. That's why not painted.
WMV carbs, I'd say mid 90's 2.5 of some sort. What's that no on side of block. That would tell...
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16-03-2015, 02:48 AM
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#4
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BAD HABIT
Country: FRANCE
Interests: speed on water/technics
Boat make: INVADER
Engines: MERC 250XS/SM 1.62
Cruising area: south Britany
Join Date: May 2007
Posts: 563
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mercury powerhead
I'd say warranty exchange or replaced block and heads too, as the reeds supports, thermostats cover are black and other minor parts .
The voltage regulator used on this powerhead was installed on serial number 0C100861 to 0C291519 so year between 1989 to 1991.
This type of regulator was used also on 2.5liter year 1991 only serial 0C 291520 thru 0D081999.
I can't find this regulator or later V6 models.
not enough numbers to be more accurate, sorry, could be a 2.4liter or a 2.5 1991 (they use 7 petals on 200hp this particular year). What carbs references are you used?
For the 2.5 200hp 1991 easy to find how many petals you have thru the carbs.
looks like it's not a racing powerhead but a powerhead rebuild where they removed the oil injection. This kind of voltage regulator was not used on racing carb engine as far I know.
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16-03-2015, 10:00 PM
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#5
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Registered User
Location: Sarisbury Green
Occupation: Electrician
Interests: Racing
Boat make: Ring 34
Engines: Mercruisers
Cruising area: Solent
Join Date: Dec 2009
Location: Sarisbury Green
Posts: 415
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Got the serial number, according to midas its a 150/200 Promax???? Ive bought it so will see over the next few days.
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16-03-2015, 10:57 PM
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#6
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BAD HABIT
Country: FRANCE
Interests: speed on water/technics
Boat make: INVADER
Engines: MERC 250XS/SM 1.62
Cruising area: south Britany
Join Date: May 2007
Posts: 563
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Promax ?
Your serial number on the block goes to promax EFI engine, or you've a carbs engine, and after several checks I cannot find this type of water cooled voltage regulator other than stock engines, looks like your engine is made with different parts between promax and carbs. On race 2.4 and 2.5liter carb race engines they don't use watercooled voltage regulator. Strange...
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16-03-2015, 10:58 PM
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#7
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,803
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Ser no isn't recognised.. so I'd go with swapped parts.
Promax is injection
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16-03-2015, 11:29 PM
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#8
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Registered User
Location: Sarisbury Green
Occupation: Electrician
Interests: Racing
Boat make: Ring 34
Engines: Mercruisers
Cruising area: Solent
Join Date: Dec 2009
Location: Sarisbury Green
Posts: 415
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I think possibly started as a efi then efi has been removed and replaced with carbs. what HP roughly would this be?
Cheers
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16-03-2015, 11:32 PM
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#9
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Registered User
Location: Sarisbury Green
Occupation: Electrician
Interests: Racing
Boat make: Ring 34
Engines: Mercruisers
Cruising area: Solent
Join Date: Dec 2009
Location: Sarisbury Green
Posts: 415
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PS anyone got the parts to convert to EFI?????? 
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17-03-2015, 12:06 AM
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#10
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The Doc
Join Date: Mar 2004
Posts: 8,291
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A promax 150/200 block & from half have few if any differences to a std 200hp Mercury. The 225 is a different animal
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17-03-2015, 12:12 AM
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#11
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,803
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And what an animal!! Best motor merc ever built in my opinion!!!
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