Author Topic: M2A1 Front End and Engine Rebuild  (Read 22536 times)

steve1973

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M2A1 Front End and Engine Rebuild
« on: February 04, 2015, 02:34:33 AM »
Well, this will be another chapter in my halftrack restoration. I left off two years ago with rebuilding the entire rear of the halftrack from the B pillars back down to the frame. I rebuilt the rear drive axle, installed a original rear floor, had made new track armor and installed new tracks. All this just in time for the MVPA convention in 2013. This last summer, 2014, I put some 200 miles on my track ending at Don's house for his yearly Camp Gleason. Just prior to all this I blew a head gasket. While changing that the cylinders were inspected and were in rough shape with pitting where the engine sat for many years. My mechanic adjusted the timing and it started easier but ran rough driving. Afer the event he came out to Don's to look at both of our tracks as his was running rough also. we put new plugs in mine and he re-adjusted the timing. It was then he gave me the bad news. I have a low end rod knock. That was it so me. Don trailered my track back to the shop awaiting a new engine.

So, the game plan is to remove the front armor, drop the transmission and transfer case, pull the engine for rebuild, repair radiator and radiator armor and put everything back together. If time allows I will also pull the cab/cowling as an assembly for rebuild, sand blast and paint everything and have it ready for the 2016 convention in California if not Tower Park first.

So on Monday, with the help of Don, the hood, fenders and front armor came off. I think I busted every knuckle I have. All I can say is I love my air tools and air chisle to split nuts.  ;D  Here are som photos of my progress so far.











Upon further inspection I found several items needing replacing. They are:

Driver's side radiator support. Not sure if there is a difference between left and right. Mine is broke.



Control rod to open and close the shutters along with turnbucle in cab.



Upper radiator armor brace. I will have to verify wich side and will get a photo. This looks to be a cast piece and has a raised mount for the X-brace.

That's all for this report.

Steve A.

Darth_Kitten

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Re: M2A1 Front End and Engine Rebuild
« Reply #1 on: February 04, 2015, 09:37:42 AM »
fun fun fun!! :) :) :) :)

steve1973

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Re: M2A1 Front End and Engine Rebuild
« Reply #2 on: February 04, 2015, 10:03:15 PM »
I finished disassembling the front nose section. The broken brace I need is for the driver's side. See photo below. I also rummaged through one of my parts bin and found a control louver rod so that is one item off my list.



So, I need one of the braces above and a radiator side rod support. any help is greatly appreciated.

Steve A.

bright87

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Re: M2A1 Front End and Engine Rebuild
« Reply #3 on: February 05, 2015, 07:16:44 PM »
Steve-
I checked my spares and I only have an extra passenger side-sorry.
« Last Edit: February 06, 2015, 06:08:35 PM by bright87 »

emptyhead

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Re: M2A1 Front End and Engine Rebuild
« Reply #4 on: February 14, 2015, 06:51:29 AM »
Steve do you have a pic of where that l bracket is located when I took my front end apart I had nothing like that up there. Thanks

steve1973

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Re: M2A1 Front End and Engine Rebuild
« Reply #5 on: February 14, 2015, 01:44:42 PM »
There are two or three types of front end armor as fare as the way it is put together. I will try and get some photos next week of mine and it is in pieces now.

Steve A.

emptyhead

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Re: M2A1 Front End and Engine Rebuild
« Reply #6 on: February 15, 2015, 06:13:35 AM »
Thanks steve

steve1973

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Re: M2A1 Front End and Engine Rebuild
« Reply #7 on: February 16, 2015, 08:04:54 PM »
Here are some photos of the two different styles I have. First is the older style as in the manual.





Here is the later style with the X brace and the 90 degree braces.





Steve A.

emptyhead

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Re: M2A1 Front End and Engine Rebuild
« Reply #8 on: February 21, 2015, 06:58:37 AM »
Thanks steve I have the earlier style.

steve1973

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Re: M2A1 Front End and Engine Rebuild
« Reply #9 on: March 01, 2015, 02:09:02 PM »
Made a little more progress since I last posted. I removed all three drive lines, removed the PTO, removed most of the front floor boards and the lower cross brace under the transmission. I hope to remove the radiator and transmission tomorrow, I still need to remove the exhaust first. Here are some new photos.

The one smart thing I did this time was to remove the steering wheel for more room. Sure is nice having the right tool for the job. I got the puller from Saturn Surplus.










Steve A.
« Last Edit: March 01, 2015, 02:12:47 PM by steve1973 »

steve1973

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Re: M2A1 Front End and Engine Rebuild
« Reply #10 on: March 31, 2015, 09:45:01 PM »
I'm making slow progress on my track. I got the winch off today and removed the rest of the floor plates and supports. I'm having trouble seperating the tailpipe form the muffler. That is the only thing holding me up from removing the transmission. I'm hoping to have the transmission out by Friday. Photos below.

Steve A.






steve1973

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Re: M2A1 Front End and Engine Rebuild
« Reply #11 on: April 08, 2015, 03:08:15 AM »
I made some big progress on Monday with the help of Don. We removed the front armor/cowling, transmission and engine. The halftrack looks kind of funny with only the rear armor on it. Once I get back from Tower Park I will finish stripping the frame getting it ready to clean and paint. I will most likely remove the front axle as I have a broken leaf spring to replace and it will be easier to clean.









Steve A.

steve1973

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Re: M2A1 Front End and Engine Rebuild
« Reply #12 on: July 22, 2015, 06:35:04 AM »
It's been two long months since I last worked on my track. Monday I put 12 hours in at my shop and with help from Don and my mechanic Matt I got a lot done. Thanks guys. First, finish stripping the front half of the frame. The front axle was removed along with the springs and spring hangers. There where some other brackes and brake fittings that were also removed. I also put a temporary pintle on the front bumper. I made a bar wit D rings on both ends so that I can move my track in and out of my shop with my truck. I made two videos on Youtube in the past loading two halftracks on a flatbed truck using same method.

Here are the videos

https://youtu.be/PxAGHzSOQz8

https://youtu.be/VRtZfI443P8

Photos...







The second haf of the day was spent tearing down not one but two motors. The first was my spare motor that I purchased from my mechanic some years ago and the second came from my track. This took the rest of the evening and wrapped things up at 8 PM just in time for me to go to work. What a day. We got a lot done. Now for some cleaning.

Engines before





Backup engine after



My engine after











Steve A.
« Last Edit: July 22, 2015, 06:38:29 AM by steve1973 »

supertrack

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Re: M2A1 Front End and Engine Rebuild
« Reply #13 on: July 29, 2015, 04:33:00 AM »
lot of job here  :)

steve1973

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Re: M2A1 Front End and Engine Rebuild
« Reply #14 on: October 19, 2015, 06:58:34 PM »
Now that summer is over I can get back to work on my halftrack. progress has been slow. I still need to clean the frame but the front axle and all the front suspension components have been cleaned. Some parts have been painted and re installed. I delivered my engine to my mechanic, Matt, so he can start on the rebuild.





The block will be bored out .040 over while the crank will be .010 under on the rod and main bearings. The cam will remain standard. All the parts have been ordered to rebuild both engines. I sent out the shocks, carburetor and fuel pump for rebuild and just got those back today. They look great.





More to come.

Steve A.