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Unread 04-26-2002, 08:26 PM   #1
evilpsych
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'49 willys Go-Devil motor

hey guys.. picking up a willys w/ this mill this weekend.. anyone know what weight oil you're suposed to use?
what about gear oil for the diffs (timken axles), TC (ATF i guess??), and the tranny (T-90). what about the fact that it was designed for leaded gas? what do i do about this..

wondering about the synthetic oils and how they would work in the motor once it's rebuilt...

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Unread 04-26-2002, 11:31 PM   #2
jeepdaddy2000
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Ok, I've got my "older than God" manual out.It does'nt list a "Go Devil" motor, however there are only options.The 134" 4cyl "F" head and the 148" 6cyl(also a flat head design).According to the manual 20 wt is recomended, however this manual was printed in 1951,long before ash based multi-gtrade detergent oils were around. On a rebuilt motor with the proper clearances a 15-40 or straight 30wt would be fine. As for synthetics, personaly I don't feel the advantages out weigh the cost for the avarage driver.Your question on the boxes. no ATF here, straight 90WT in everything. As for leaded gas, you can install hardend valve seats if you want, but I don't think there is much of a worry. If you need any engine data,E mail me with your list and I'll give you what I have.
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Unread 04-27-2002, 12:01 AM   #3
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the go devil is the original engine in jeeps period..

<a href="http://www.off-road.com/jeep/tech/engine/godevil134.html" target="_blank">go-devil</a>
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Unread 04-27-2002, 06:42 AM   #4
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</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by evilpsych:
<strong>the go devil is the original engine in jeeps period..

<a href="http://www.off-road.com/jeep/tech/engine/godevil134.html" target="_blank">go-devil</a></strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">I would change out the motor. Something that is easierto find parts. Unless you plan on making a stock classic out of it.
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Unread 04-27-2002, 01:20 PM   #5
4wheeler4CJ
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jeepdaddy pretty much covered it.

I am a fan of the 20W-50 oils (I'm sure everyone knows by now, LOL!) or 30W. But, as jeepdaddy mentioned, the 15W-40 would be a good break-in oil at first. Wouldn't recommend synthetics in that motor.

Let's face it, synthetics are OK if you're running a NASCAR or Indy Car, but no daily driver really needs it, LOL. Do the math on the $$$ difference, and it'll blow your mind. Nobody blows motors because they use dino oil instead of synthetic, LOL. Motors go because of poor maintenance, pure and simple. <img border="0" title="" alt="[Wink]" src="wink.gif" />

I think the Go-Devil motor is a cool motor, keep it, and rebuild it, it's a novelty, as is any Jeep! And parts are NOT hard to find, it's a very very common motor, parts availability is fine.

However, as far as the gas goes, rather than spending big money on the good lead substitute, I would use hardened valve seats also, since you will be rebuilding it anyway. They will burn out quicker if you use regular ones and dont use the lead substitute. The substutute is a pain...much easier to pull up, pump, and go
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Unread 04-27-2002, 09:57 PM   #6
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</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by evilpsych:
<strong>the go devil is the original engine in jeeps period..

<a href="http://www.off-road.com/jeep/tech/engine/godevil134.html" target="_blank">go-devil</a></strong></font><hr /></blockquote><font size="2" face="Verdana, Arial">So is it the 134 F head?
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Unread 04-28-2002, 10:43 AM   #7
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no it's an L head.. valves for intake and exhaust are in the Block.. whereas on the f-head.. the valves for intake are in the head i believe..
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Unread 04-28-2002, 11:18 AM   #8
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I'll check my book to make sure, but i believe it is the other way around evil....F-Head was the first generation 134 with valves in the block, L-Head was the second generation 134 with valves in the Head. I'll check later in my book to make sure. I have some really good Jeep History Books <img border="0" title="" alt="[Wink]" src="wink.gif" />
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Unread 04-28-2002, 11:22 AM   #9
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I'll check my book to make sure, but i believe it is the other way around evil....F-Head was the first generation 134 with valves in the block, L-Head was the second generation 134 with valves in the Head. I'll check later in my book to make sure. I have some really good Jeep History Books <img border="0" title="" alt="[Wink]" src="wink.gif" />
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Unread 04-28-2002, 11:32 AM   #10
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No evilsych is right, I was refering to the L head, I've worked on many of them but never heard them refered to as "Go devil".I guess this will fill a hole in my memory banks. Thanks for the info.
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Unread 04-28-2002, 06:02 PM   #11
evilpsych
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yeah.. the go-devil was originally designed by the overland company.. and willys merged with them pretty much to get that engine because it was so reliable. the L-head was the engine in ALL of the original WW2 willys jeeps..
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Unread 04-30-2002, 03:01 PM   #12
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Sorry, I was suffering from a case of lysdexia

Just checked the book, the L-Head WAS the first one. Sorry evil, had to see for myself, I was so convinced the F was first for some reason (F for "First", LOL, I dunno!)! I was having brain-farts! LOL <img border="0" title="" alt="[Wink]" src="wink.gif" />
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Unread 04-30-2002, 05:33 PM   #13
evilpsych
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hehe yeah.. the F-head many people falsely believe that came about due to ford's part in building the GPW durint WW2 as a secondary plant.. f=ford is not true.. F just happened to be what was stamped on the head bolts on the motor... thus "F-Head"
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'93 YJ, 4.0, K&N filter, Borla Header, Borla Cat-Back, Hi-Flo Cat, 3 Core Radiator, D-Rings, TruckNuts, MSD 6A, LockRite Locker in D30, Magnecors, Kickass Stereo, 1" daystar, 31" BFG AT's, Homemade Rocker Guards and Front/Rear air-tank bumpers with tire carrier, 15x8 AR-767 4"BS, BDS 3.5 HD lift, AMA A/C Kit, York OBA, GoFerIt 1" MML, 8,000lb HF/MM Winch, Magellan MAP 330 GPS, PRO-2067 500ch. Scanner, oh, and a CB capable of talking to SATURN!

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Unread 04-30-2002, 05:34 PM   #14
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oh .. plus it was used to distinguish the differences in the two blocks..
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'93 YJ, 4.0, K&N filter, Borla Header, Borla Cat-Back, Hi-Flo Cat, 3 Core Radiator, D-Rings, TruckNuts, MSD 6A, LockRite Locker in D30, Magnecors, Kickass Stereo, 1" daystar, 31" BFG AT's, Homemade Rocker Guards and Front/Rear air-tank bumpers with tire carrier, 15x8 AR-767 4"BS, BDS 3.5 HD lift, AMA A/C Kit, York OBA, GoFerIt 1" MML, 8,000lb HF/MM Winch, Magellan MAP 330 GPS, PRO-2067 500ch. Scanner, oh, and a CB capable of talking to SATURN!

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Unread 05-01-2002, 01:25 PM   #15
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The F-Head was definitely an improvement over the L-Head, for both the 4 and 6.
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