Topic: Big Twin Fuel Pump Conversion – Page 2 – Antique Outboard Motor Club,Inc

This topic has 18 replies, 5 voices, and was last updated 4 years, 5 months ago by Jersey Jim.

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May 27, 2021 at 5:40 pm #239096
crosbyman
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Canada Member
see video on this link….Pump on a side cover

🙂
https://forums.iboats.com/threads/evinrude-33hp-ski-twin-running-poorly.745872/

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May 27, 2021 at 6:44 pm #239109
outboardnut
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May 27, 2021 at 6:44 pm #239114
outboardnut
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May 27, 2021 at 7:54 pm #239121
crosbyman
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easy as pie 🙂

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May 28, 2021 at 11:42 am #239142
amuller
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Several valid approaches are described in this thread. I think mainly it depends on how original you want it to look. Elsewhere I have seen suggestions to REPLACE a transfer cover with a flat aluminum plate. This I would not do as I can´t believe it wouldn´t mess with the performance of that cylinder.

The pic of the early covers with a boss look as if they are intended to be drilled and tapped for one eighth pipe thread for a remote pump. Possibly this was an early Gale setup…

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checkmate57
May 28, 2021 at 1:03 pm #239146
crosbyman
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Canada Member
Possible impact yes but if the bypass cover empty volume of the unused quadrants are fill up or.. all with a simple 1/4 hole drilled in line with the pump would it matter that much compared to tapping for an nipple and hose back to the pump ??

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May 31, 2021 at 2:31 pm #239243
Jersey Jim
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Thanks for all your help so far. I am ready to order parts for this conversion and know where to get them.. In the mean time, I want to replace the water pump impeller and do a general tune up of ignition, cylinders, etc. Does anybody know where I can find repair and parts manuals for this 25 HP 1953/54 Evinrude Big Twin? Can’t find anything prior to 1955 on Ebay or elsewhere.
May 31, 2021 at 2:49 pm #239247
crosbyman
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Canada Member
As AOMCI member you would have access to the johnson/evinrude manual 400 pages + that covers all you need from early 40s to late 60s repair wise 🙂

in the MEMBERS ONLY section under INNER SANCTUM… library Garry Spencer’S drop box for an easy download

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- This reply was modified 4 years, 5 months ago by crosbyman.
June 3, 2021 at 7:03 pm #239468
Jersey Jim
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Garry Spenser’s very fine repair manual (Evinrude Sv. Rev. 54 pdf) has 9 sections. All are there except Section V Lower Unit Service Information. I can’t win for losing.
- This reply was modified 4 years, 5 months ago by Jersey Jim.
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