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Thread: Changes to Promax water routing
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05-23-2017, 09:24 PM #1
Changes to Promax water routing
My 2000 Promax has no hose running from the top of the block to poppet. I have seen others run that way. The thermostats dump port side to telltale, starboard side to the adapter.
My question is why did Mercury start installing plugs? Wouldn't the poppet hose to the top of the block help with warming the block?
Trying to help get to temp in Michigan cold water. (New thermostats, impeller, and poppet kit)
Kurt
1992 Allison XTB 21 / 225 Promax
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05-24-2017, 07:38 AM #2
I would put it back stock.
Go Time
2003XS GS 225 Promax/ 260 / 280
26 Regulator twin 250 EFI
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tux974 liked this post
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05-24-2017, 09:40 AM #3
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05-24-2017, 10:03 AM #4
I dont think they ever came that way, but I've been wrong before. The normal hose routing for the steel 2.5s is the same on all production motors. One hose from poppet to top of block and a hose from stbd thermostat to port then to tee that goes to tell tale & adapter plate.
Go Time
2003XS GS 225 Promax/ 260 / 280
26 Regulator twin 250 EFI
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05-24-2017, 10:08 AM #5
All 3/8 i.d. hose?
1992 Allison XTB 21 / 225 Promax
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05-24-2017, 11:50 AM #6
That's what I use on mine iirc
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05-24-2017, 12:43 PM #7
The tell tale maybe 5/16, but everything 3/8 will do it. Make sure you have the tell tale nipple on the end. The small hole in it helps.
Go Time
2003XS GS 225 Promax/ 260 / 280
26 Regulator twin 250 EFI
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05-24-2017, 04:56 PM #8
It makes me question why they changed it? It's plumbed like a 225x. I had one that was like that. Maybe because it is a 2000, close to the end run of production?
1992 Allison XTB 21 / 225 Promax
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05-24-2017, 05:00 PM #9
The one i had like that was a 2000 also
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05-24-2017, 07:10 PM #10
My factory service manual shows the 2000 model plumbed the traditional way. The poppet to the top of the block, starboard to port to the adapter with a tee to telltale.
1992 Allison XTB 21 / 225 Promax
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05-25-2017, 05:35 AM #11
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W2F a V-King thanked for this post
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05-26-2017, 07:30 AM #12
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05-26-2017, 07:59 AM #13
Hose size?
1992 Allison XTB 21 / 225 Promax
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05-26-2017, 09:03 AM #14
3/8 on all three nipples on top tee. Bottom tee is 3/8 from top tee & to adapter, 5/16 to tell tale.
Go Time
2003XS GS 225 Promax/ 260 / 280
26 Regulator twin 250 EFI
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05-26-2017, 01:04 PM #15
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