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08-18-2008, 10:07 PM
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#1
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Scraping Paint
City: -
Join Date: Oct 2007
Posts: 13,745
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Ford Lehman 120 fuel pump
For those of you with boats with the Ford Lehman 120 diesel, we've been having an interesting discussion on the Grand Banks forum about removing and replacing the fuel lift pump.* As I discovered last week when we thought we might have a failed pump on one engine (we didn't) even if you have a full set of conventional (Craftsman, etc.) wrenches on board you will probably not be able to remove the pump if you ever have to.* The pump mounts on a pair of studs threaded into the engine block and is held in place by small nuts on these studs.
The issue is the clearance, or lack of it, needed to remove the rear nut.* A typical, off-the-shelf box or open-end wrench will be too thick and have jaws too wide to do it.* So you need to either thin down and narrow a cheap off-the-shelf wrench or find a thin, narrow walled wrench (like a tappet wrench) that will fit onto the rear nut in such a way that will still allow you to swing the wrench.* The forward nut is no problem because there is sufficient clearance ahead of it to use an open-end wrench.* You cannot use a socket because the pump body overhangs the mounting nuts, and there is apparently not enough room behind the rear mounting nut and the big flange on the rear of the engine block casting to fit a crow's foot.
The fuel hose connection on the bottom of the pump can also be a problem and should have a "reworked" wrench to properly tighten the fitting.
So for those of you with FL120-powered boats, don't assume that because you have full sets of wrenches on board that you'll be able to remove and replace that pump if you need to on a cruise.* Make sure you have a wrench that will actually fit before you head out.
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02-09-2013, 03:13 AM
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#2
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Member
City: San Francisco
Vessel Name: Paradox
Vessel Model: Hershine 37
Join Date: May 2012
Posts: 9
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Interesting - I took mine off today with a cresent wrench!!!
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02-09-2013, 08:44 AM
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#3
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Guru
City: Cruising East Coast US
Vessel Name: Grace
Vessel Model: DeFever 48
Join Date: Apr 2008
Posts: 2,420
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Quote:
Originally Posted by billsteele
Interesting - I took mine off today with a cresent wrench!!!
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Wow big difference. Please explain?
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02-09-2013, 09:09 AM
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#4
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Enigma
City: Slicker?
Join Date: Oct 2007
Posts: 16,566
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Greetings,
Mr. Marin. Point well taken regarding specialty tools but to the best of my memory, I've not needed a "special" wrench to remove my fuel pump. It was a bit of a wiggle and a squirm but I used the regular stuff from the tool kit. What I DID find was that when I dropped a nut into the drip pan (5/16-24 ??) I didn't have a spare on board to replace. Got 6 now.
The ONE I do remember needing a "special" for is removing the expansion tank to change the thermostat. I think I had to cut down a 9/16" ?? shorter.
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02-09-2013, 09:23 AM
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#5
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Guru
City: Cowichan Bay, BC
Vessel Name: Gray Hawk
Vessel Model: Defever 43 Offshore Cruiser
Join Date: Oct 2009
Posts: 570
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Marin you can get that nut with a really good set of combination wrenches but its not pretty. The ideal wrench for the job is an offset wrench. I know this because I borrowed one from my slipmate and have been searching for a set of offset wrenches ever since. I finally found a tool store that knew what I was talking about and they have ordered a set for me which should be waiting when I get home from the boat show. On my boat you would not get that nut with any form of a crescent wrench. Offset wrenches are sometimes called ignition wrenches in the smaller sizes but finding a set that goes above 3/8" has proved to be a challenge. YMMV
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02-09-2013, 11:17 AM
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#6
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Guru
Join Date: Jan 2009
Posts: 897
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Bob, I used offset wrenches and I have used ignition wrenches, but they were very different. Chuck
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02-09-2013, 12:13 PM
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#7
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Guru
City: Cowichan Bay, BC
Vessel Name: Gray Hawk
Vessel Model: Defever 43 Offshore Cruiser
Join Date: Oct 2009
Posts: 570
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That may be Chuck but what I call an offset wrench and what I call an ignition wrench looks exactly the same except that the offset wrench comes in larger sizes. Here's an image which I shameless stole off the interweb.
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02-09-2013, 01:12 PM
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#8
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,154
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offset wrenches are bent in the handle (offset) so you can clear obstacles/other bolts/nuts...at least that's my experience... and what I see when I look up "offset wrench"..
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02-09-2013, 02:09 PM
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#9
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Guru
Join Date: Jan 2009
Posts: 897
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That's an ignition wrench. An offset is a box wrench bent at both ends. I just didn't want someone to go out and buy the wrong tool if that is the one that works for the fuel pump. Chuck
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02-09-2013, 02:17 PM
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#10
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Scraping Paint
City: -
Join Date: Oct 2007
Posts: 13,745
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The recommendation from our diesel shop, which has a lot of experience dealing with FL120s, is that the best tools for removing/replacing the aft mounting bolt for the stock fuel lift pump are a tappet wrench or a conventional wrench which has been ground down thin enough to fit, which is what a machinist friend made for us.
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02-09-2013, 03:39 PM
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#11
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Guru
Join Date: Jan 2009
Posts: 897
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Quote:
Originally Posted by Marin
tappet wrench or a conventional wrench which has been ground down thin enough to fit, which is what a machinist friend made for us.
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How about photo, there are lots of ways this could be interpreted. Chuck
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02-09-2013, 03:57 PM
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#12
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Guru
City: Cowichan Bay, BC
Vessel Name: Gray Hawk
Vessel Model: Defever 43 Offshore Cruiser
Join Date: Oct 2009
Posts: 570
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The offset wrench I posted is available to 1.25" (maybe larger). The catalog that we ordered my set out of identified it as an offset open end wrench. What was previously posted is an offset BOX wrench. The 1/2" open end version is all you need to remove the lift pump on a 120 Lehman. I've never worked on an ignition that required a wrench larger than 9/16". BICBW
As I posted previously, you can replace this pump with a couple of good sets of combination wrenches. You may need to switch back & forth between the 1/2" combination wrench from two different sets but it can be done.
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