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06-15-2013, 08:52 PM #1Member
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What years were 2.4 & 2.5 blocks built by Mercury?
I need a history lesson.....trying to settle an argument. What years were the 2.4 made, and when did they switch to 2.5?
Thanks.......1992 Bullet 20XRD -- 1995 Mercury 2.5 225 ProMax, JC’s nose-cone lower unit, 26 pitch Trophy, 10" Rapid Jack, 85mph @ 1/2” above pad (still tweaking)
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06-15-2013, 09:06 PM #2Supporting Vendor
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First 2.4 was in 1978,first 2.5 in 1991,Chris
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06-15-2013, 09:33 PM #3Member
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Thanks Chris! But I guess I just lost the argument......our newly acquired Mariner Mag II is a '91. My dad looked up a voltage regulator by serial # on marineparts.com, which said it was for a 2.5 liter. I thought this motor was a 2.4 liter. Got it running correctly today by replacing both switch boxes, but tach is still jumping around & it's not charging. The voltage regulator (danged water-cooled.....$$$) didn't ohm right, so now we've got to decide if we want to buy a new water-cooled one, or change the stator & go to a dual regulator system.
1992 Bullet 20XRD -- 1995 Mercury 2.5 225 ProMax, JC’s nose-cone lower unit, 26 pitch Trophy, 10" Rapid Jack, 85mph @ 1/2” above pad (still tweaking)
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06-15-2013, 09:37 PM #4Screaming And Flying!
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My guess is that's a 2.4 Fatblock
Erik Kiser
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06-15-2013, 09:39 PM #5Supporting Vendor
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I probably have a used water cooled one if you want to go that way around 200$,guaranteed good,Chris
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06-15-2013, 09:49 PM #6Member
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1992 Bullet 20XRD -- 1995 Mercury 2.5 225 ProMax, JC’s nose-cone lower unit, 26 pitch Trophy, 10" Rapid Jack, 85mph @ 1/2” above pad (still tweaking)
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06-17-2013, 07:47 PM #7Member
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Chris, I went over & did some more trouble-shooting today. The stator is fine & so is the reg/rectifier. I pulled the main wiring plug apart & spread all the pins, put it back together, & tach is working perfectly. It's putting a steady 13.3 volts to the battery at idle, too, so it appears to be charging correctly. Thanks for the help! If/when I DO need a reg/rec, I'll give you a call!
1992 Bullet 20XRD -- 1995 Mercury 2.5 225 ProMax, JC’s nose-cone lower unit, 26 pitch Trophy, 10" Rapid Jack, 85mph @ 1/2” above pad (still tweaking)
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06-17-2013, 07:50 PM #8Member
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06-17-2013, 08:15 PM #9
Post pictures!
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06-17-2013, 08:24 PM #10Member
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06-17-2013, 08:36 PM #11
'91 Mag II is a 2.4 fat block. Same as XR4 water cooled reg and all. '91 was a "stupid year" with a mixture of 2.0, 2.4 and 2.5 blocks that all looked tha same with exception of tha 200 2.5. 7 petal front..............Was most definitely tha last year of tha 2.4 even if it "looked like" a 2.5.......
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06-17-2013, 08:38 PM #12
If it'a a '91 fatblock, pulling the heads is the best way to see if it's a 2.4 or 2.5. 2.4 fat block and 2.5's have dowel pins to align the heads..... 2.4 cylinder has a bore of 3 3/8" and the 2.5 is 3 1/2", from the outside, they look the same .... there was a thread on here not too long ago where someone sold a 2.4 fatblock as a 2.5, they are easy to mix up.........
"One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .
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06-17-2013, 08:41 PM #13Member
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1992 Bullet 20XRD -- 1995 Mercury 2.5 225 ProMax, JC’s nose-cone lower unit, 26 pitch Trophy, 10" Rapid Jack, 85mph @ 1/2” above pad (still tweaking)
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06-17-2013, 08:46 PM #14Member
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You were typing while I was.....we had to put one head on it when we got it. Had a crack (actually a casting flaw) that was letting water into one cylinder. It definitely had dowels, but I didn't measure the bores. You have, however, told me how to tell for sure, so thanks!
1992 Bullet 20XRD -- 1995 Mercury 2.5 225 ProMax, JC’s nose-cone lower unit, 26 pitch Trophy, 10" Rapid Jack, 85mph @ 1/2” above pad (still tweaking)
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06-17-2013, 08:47 PM #15
A 2.4 fat block is a 2.5 block with 2.4 cylinders in it.......
"One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .