Coil problem

M151 General Discussion and Chat Board

Coil problem

Postby 41CCKW » Fri May 07, 2010 11:49 am

I am working on a M151 A1 for a museum and it has a bad coil. The coil has a plastic shell that has cracked in several places and leaked oil into the distributor. The bad coil is different than the other coils I have seen for sale. Here is the info that is on the bad coil.

ORD PT No. 8712400
MFR PT No. 200735 (D)
Prestolite 24V
Use with external resistor


It is shorter than the other USGI coils I have seen and it sits on a disk with two wires coming out of it. The other coil I have is too tall and will not work. Anyone know if these coils are still availble?
41CCKW
G-Staff Sergeant
G-Staff Sergeant
 
Posts: 63
Joined: Sun Dec 03, 2006 11:45 pm
Location: Los Banos, CA

Re: Coil problem

Postby SURPDLR » Fri May 07, 2010 12:17 pm

41CCKW wrote:I am working on a M151 A1 for a museum and it has a bad coil. The coil has a plastic shell that has cracked in several places and leaked oil into the distributor. The bad coil is different than the other coils I have seen for sale. Here is the info that is on the bad coil.

ORD PT No. 8712400
MFR PT No. 200735 (D)
Prestolite 24V
Use with external resistor


It is shorter than the other USGI coils I have seen and it sits on a disk with two wires coming out of it. The other coil I have is too tall and will not work. Anyone know if these coils are still availble?


The "Disk with two wires coming out of it" IS the exernal resistor mentioned above. The "Tall coil" is interchangable with the"short coil and resistor.
JEFF HAIN-MATSON
FRONT LINE MILITARY VEHICLES
WRIGHTSVILLE PA
717-252-4489

INDIAN 741
INDIAN 841
MATCHLESS G3
MATCHLESS G3L
AND SEVERAL OTHER WHEELED AND TRACKED TOYS!!

MVPA #1833
IMPS #1726
MVT #9362
User avatar
SURPDLR
G-Second Lieutenant
G-Second Lieutenant
 
Posts: 574
Joined: Sun Oct 03, 2004 7:14 am
Location: PENNSYLVANIA

Re: Coil problem

Postby 41CCKW » Fri May 07, 2010 12:55 pm

So I should be able to remove the resistor and and use the other "tall" coil I have?
41CCKW
G-Staff Sergeant
G-Staff Sergeant
 
Posts: 63
Joined: Sun Dec 03, 2006 11:45 pm
Location: Los Banos, CA

Re: Coil problem

Postby Ben Dover » Fri May 07, 2010 1:31 pm

In the late 60's a shorter 24V Coil with an external ballast resistor placed beneath it was introduced by Prestolite. It had something to do with allowing cooler operation of the coil. The older longer coil will work just fine.
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
Ben Dover
Gee Addict
 
Posts: 39623
Joined: Sun Mar 02, 2008 2:37 pm
Location: Proving Ground

Re: Coil problem

Postby raymond » Fri May 07, 2010 6:32 pm

Be careful with handling that oil. Older coils made before the late 1970's had PCBs in the dielectric oil. PCB is bad stuff. It is a known carcinogen. It's effects are cumulative as it builds up in fat in the body. PCB also will easily soak through most types of commonly used rubber, PVC, or latex gloves, so they should be immediately disposed of when cleaning up.

Raymond
Modern journalism is all about deciding which facts the public shouldn’t know because they might reflect badly on Democrats
User avatar
raymond
G-Lieutenant General
G-Lieutenant General
 
Posts: 7072
Joined: Mon Jan 15, 2007 3:53 pm
Location: God's country, Clarksville Mo.

Re: Coil problem

Postby lten1063 » Mon May 31, 2010 3:04 pm

I have seen the shorter coils with a foam rubber spacer in the bottom. Remove the foam spacer and the tall one should work just fine. If you have a shorter coil and no foam/rubber spacer then make one out of and old inner tube or other like material to obtain the correct highth.

Later Joe
"Apply The 5 "P" theory" (Previous Planning Prevents Poor Performance)"
"When something becomes FUBAR We Blame it on SNAFU Then Try to SWAG Our Way Out of it"
"My Wooden Nickels Worth"
"If ur Running Late, slo down & Walk Early next X"
User avatar
lten1063
G-Colonel
G-Colonel
 
Posts: 1842
Joined: Fri Apr 01, 2005 7:34 pm
Location: GERONIMO, OKLAHOMA-USA

Re: Coil problem

Postby 41CCKW » Mon May 31, 2010 8:27 pm

I got it fixed. With the resistor removed the tall coil fit right in and the engine runs. Now on to the exhaust leaks :evil:
41CCKW
G-Staff Sergeant
G-Staff Sergeant
 
Posts: 63
Joined: Sun Dec 03, 2006 11:45 pm
Location: Los Banos, CA

Re: Coil problem

Postby lten1063 » Tue Jun 01, 2010 9:20 am

41CCKW wrote:I got it fixed. With the resistor removed the tall coil fit right in and the engine runs. Now on to the exhaust leaks :evil:


Where is it leaking at?

Later Joe
"Apply The 5 "P" theory" (Previous Planning Prevents Poor Performance)"
"When something becomes FUBAR We Blame it on SNAFU Then Try to SWAG Our Way Out of it"
"My Wooden Nickels Worth"
"If ur Running Late, slo down & Walk Early next X"
User avatar
lten1063
G-Colonel
G-Colonel
 
Posts: 1842
Joined: Fri Apr 01, 2005 7:34 pm
Location: GERONIMO, OKLAHOMA-USA

Re: Coil problem

Postby 41CCKW » Tue Jun 01, 2010 4:57 pm

The two exhaust ports in the middle of the head are leaking. I tried the copper gaskets but that did not work. I was going to replace the exhaust manifold with a NOS one but the owner of the MUTT did not get one and told me "Just get it running with what we have" :roll:
41CCKW
G-Staff Sergeant
G-Staff Sergeant
 
Posts: 63
Joined: Sun Dec 03, 2006 11:45 pm
Location: Los Banos, CA

Re: Coil problem

Postby Maverick1701 » Sun Apr 09, 2017 4:20 pm

I ahve this exact issue. How did you remove the resistor from the distributor? I can't see to get it out.
Chris

1997 4x4 Ford Expedition

2003 KLR650 Motorbike

1967 6x6 Kaiser Jeep M35A2 w/winch

1954 M38A1

M998 HMMWV (work toy)
Maverick1701
G-First Sergeant
G-First Sergeant
 
Posts: 133
Joined: Thu Jan 20, 2011 6:35 pm
Location: Memphis, Texas

Re: Coil problem

Postby Ben Dover » Sun Apr 09, 2017 7:03 pm

Pull up on the wires.
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO
Ben Dover
Gee Addict
 
Posts: 39623
Joined: Sun Mar 02, 2008 2:37 pm
Location: Proving Ground


Return to M151 General Discussion Board

Who is online

Users browsing this forum: No registered users and 2 guests