61-79-list-digest Friday, December 18 1998 Volume 02 : Number 564



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Ford Truck Enthusiasts - 1961-1979 Trucks and Vans
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In this issue:

Re: FTE 61-79 - Ruptured diaphram(bearings/gasoline)
FTE 61-79 - Re: Fuel Pump Problems
Re: FTE 61-79 - 79 351M is doggy
FTE 61-79 - Re: FE Fuel Pump, with ?'s
Re: FTE 61-79 - Dipstick location
FTE 61-79 - 460-low oil pressure

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Date: Fri, 18 Dec 1998 00:17:04 EST
From: SHill48337 aol.com
Subject: Re: FTE 61-79 - Ruptured diaphram(bearings/gasoline)

I have to throw my thoughts in on the subject of gasoline being a lubricant.
Any clean fluid, including air, can be a lubricant if the bearings are
designed to use it. A good lubricant will carry a load and prevent metal to
metal contact while removing any heat generated. Fuel pumps in you tank are
designed to use gasoline for lubrication and cooling. The bearing surfaces in
your engine are designed to use a heavier fluid such as motor oil. If gas is
introduced to your crankcase it will significantly reduce the load carrying
ability of your oil. Not to mention the residues left behind as the gasoline
evaporates, which can cause things such as lifters to get sticky. And of
course you enhance the possibility of a crankcase explosion and fire. If any
of you are familiar with large diesel engines, crankcase explosions take place
when a bearing gets hot and vaporizes the oil making an explosive mixture that
does major damage when it blows. Gasoline in the oil lowers the ability to
carry load, you get metal to metal contact and thus the possibility of
tremendous heat generation. Of course you would need about a quart of gas in
your crankcase to bring this about. You would have to introduce the gas at a
good rate to get this much gas in the oil as the gas evaporates quickly until
you are left with the consituants of gas that boil at temperatures above 200
degrees F. 2 cycle oil/gas lubes the pistons and rings in 2 cycle engines,
but bearing in these engines are of a totally different design. Looks like I
got carried away, sorry.
Burt Hill Kennewick, WA 1972 F-250 4x4 460
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Date: Thu, 17 Dec 1998 21:34:20 -0800 (PST)
From: Dan Lee
Subject: FTE 61-79 - Re: Fuel Pump Problems

You Wrote:
> Subject: FTE 61-79 - Fuel pump problems
>
> I put 3 fuel pumps on my 71 360FE 4x4 before (I carry a spare) I
tore it
> apart for the resto. I did this in 19 months (3,000 miles) with
MasterParts
> brand rebult pumps. Each time the truck would run crappy then cut
out, a
> little fuel would leak out the diaphram but not all over the engine.
>
> I feel some of this may be a poor rebuild?! When I get the engine
rebuilt,
> I will buy a new Carter if I can locate one. Actually, I will buy
two and
> keep one behind the seat of the truck.
>
> Also, I snagged a couple of sets of my wife's hemastats (spelling)
from her
> Nursing bag to use for clamping the lines off if I ever needed to
on the
> road. They work well and do not cut the rubber hose.
>
> Do not comment on this one Deacon! ;^)
>
> Stu
> Nuke GM!
> http://www.ford-trucks.com//lc/lc.php?action=do&link=http://www.pscico.com/stu
>
> >"I had a diaphram (sp) burst in a fuel pump and with each pump a
stream
> >of
> >
> >fuel shot up on the engine. Wonder if it would ever burst at another
> >place
> >
> >
You can buy a gauge to test the fuel pump pressure. It should be
between 5-7 lbs. Actally mechanical pumps tend to produce excessive
pressure at high RPMs. This can cause the needle valve to allow excess
gas into the float chamber. The mixture will then be too rich, the
plugs may foul and when idled again run rough.
I put a block-off plate on my 351C and installed a Carter Electric
pump. It was reasonably priced from Summit Racing. I use that with a
750 CFM Carter without a problem.

Dan Lee
'53 F100
351C-4V

_________________________________________________________
DO YOU YAHOO!?

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Date: Fri, 18 Dec 1998 00:40:43 EST
From: SHill48337 aol.com
Subject: Re: FTE 61-79 - 79 351M is doggy

I agree with those who have said check the jets in your carburetor. Go 2
sizes larger and see how that works. However, you do need to verify your
vacuum, if it is off significantly, as others have said your cam timing is
probably off. Keep in mind the mods you made to the exhaust system make your
engine run lean thus the power will drop off a lot. Even if your cam is not
timed correctly, I suspect it is correct, your jets still probably need to be
increased anyway.
Burt Hill Kennewick, WA 1972 F-250 4x4 460
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Date: Fri, 11 Dec 1998 06:38:25 -0800
From: Pat Brown
Subject: FTE 61-79 - Re: FE Fuel Pump, with ?'s

Jim wrote:
> It runs fine for a while, idle, high road speed (like 30 min).
> Then falls apart at idle when coming to a light. From that
> point, mess with mixture, timing, etc. no combo seems to work.

[fuel pump suspect deleted]

Wow. Deja-vu all over again. A few years back, I did a ring and
valve job on a little Boo-ick Skyhawk I had (HAD, OK, HAD).
It did the exact same thing you describe. Start up, drive around
town, no problem. Get on the freeway for five minutes, then off,
for the next 5 minutes it would stall at every stop. Drove me
absolutely nuts, but I learned a lot about EFI (GM throttle body
stuff, anyway). After a week or so of tinkering, I decided to
start over and assume I knew nothing about the car. I took apart
and inspected everything. Adjusted anything I could. I looked at
the PCV valve, and said to myself, naaa, the grommet will break
when I pull it out . . . Then I realized, that's what I told
myself the first time I looked at it. Out it came (and the grommet
fell into pieces), it was filthy! A quick cleaning, on the test
ride down to Pep Boys to get a new valve (and a silly grommet)
it ran great. Afterwards, I figured on the freeway the valve was
open constantly, and would actually get stuck open in all that
goo! Giant vacuum leak would case stalling at idle, but it would
always start right back up. After a few minutes, the valve would
get unstuck (remember, it was sticky, gooey stuff), and everything
would run normal. So, keep that PCV valve clean, and above all,
don't drive Boo-Icks!
- --
Pat Brown
'Nukin GM from Sebastopol, California

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Date: Thu, 17 Dec 1998 23:32:07 -0800
From: Tim Bowman
Subject: Re: FTE 61-79 - Dipstick location

Azie:

I stand corrected. My experience has been in 4x2's only (but a whole
lot of them). Thanks for your input.

Tim

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Date: Thu, 17 Dec 1998 23:47:42 -0800
From: "Pete and Shell"
Subject: FTE 61-79 - 460-low oil pressure

i have a 460 with oil pressure that when i first start it up runs at 65-70
psi,but as it warms up it drops off to around 15 psi at an idle,and will go
back up to around 45-50 psi if you rev it up.Any thoughts as to what the
problem might be would be greatly appreciated,thanks.

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End of 61-79-list-digest V2 #564
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