GPW Engine First Startup

1941 - 1945, MB, GPW Technical questions and discussions, regarding anything related to the WWII jeep.
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ritterdl1945
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GPW Engine First Startup

Post by ritterdl1945 » Fri Sep 23, 2016 7:36 pm

I have an October 44 GPW engine that I have just finished the rebuild, my question is ... what is the general opinions about the initial startup and break-in.
I have read several different procedures for this and would like to hear from those that have much more experience with flat tappet engines. Some write ups
say crank with starter till oil pressure comes up, start for a few seconds and repeat with longer runs each time. Specific articles I have read say to start
and bring to higher RPM level immediately for 15 to 20 min to allow tappets to age to prevent damage to cam or tappets. I do plan to do a pressure pre-lube
of the engine through an external oil galley plug prior to starting it up.
I know each of you that has fired up the engine for the first time always review what could go wrong and try to prevent all the work you have put into
your restoration going down the tubes and I just thought I would ask and 'listen' to the opinions of the experts on the 'G'.

Thanks
Dave
Willys MB
MB1286xx
DoD Mar 17, 1942
Restoration 100%

Willys MB
MB4080xx
DoD Jan 18, 1945
Restoration 100%


ritterdl1945
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Re: GPW Engine First Startup

Post by ritterdl1945 » Sat Sep 24, 2016 5:34 am

That's good info. I am using a modem two piece rear seal (the good one I hope)
Has anyone used the Lucas Zinc startup additive during breakin?
Dave
Willys MB
MB1286xx
DoD Mar 17, 1942
Restoration 100%

Willys MB
MB4080xx
DoD Jan 18, 1945
Restoration 100%

Ralph
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Re: GPW Engine First Startup

Post by Ralph » Sat Sep 24, 2016 5:49 am

Hi Dave,
I used the Lucas zinc on my rebuild/start-up...there are other ok brands...conventional wisdom on conditioning flat tappets...
Remember to top off coolant to baffle bottom after the thermostat opens as it comes up to heat.Best luck-
Ralph

dinof
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Re: GPW Engine First Startup

Post by dinof » Sat Sep 24, 2016 11:01 am

All I did was make sure oil pump was full of oil and then I shot some motor oil into the cylinders. I tend to give it plenty to protect the rings. Motor runs great 16+ years.
Dino Falabrino
On the "G" since 1998.
1943 GPW 102310 DOD 3-3-43
1928 Model A Roadster Pickup
1930 Model A Tudor
1968 Taco Minibike

ritterdl1945
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Re: GPW Engine First Startup

Post by ritterdl1945 » Sat Sep 24, 2016 11:16 am

Pampering is a 'good' thing....is it not?? Considering all
they did for us!
Dave
Willys MB
MB1286xx
DoD Mar 17, 1942
Restoration 100%

Willys MB
MB4080xx
DoD Jan 18, 1945
Restoration 100%

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dpcd67
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Re: GPW Engine First Startup

Post by dpcd67 » Sat Sep 24, 2016 12:20 pm

I always use Lucas high zinc break in oil, and just run them; no break in ritual. Except for the 340 I did 3 years ago; I did break in the new cam IAW the instructions provided by Comp Cams. I am building a 230 now, with a NOS cam in it, and I will use the high zinc oil; I will try not to over rev it too much, at first.
U. S. Army 28 years.
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