Weird project 151

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terratek
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Re: Weird project 151

Unread post by terratek » February 18th, 2019, 2:01 am

Travis came by today and we managed to get a bit more work done.

At this point the carburetor has been removed, starter was pulled to get the trans cap and shift forks off, then reinstalled so we could hit the ignition while beating on things.

Transmission is a rust bucket, there was no fluid in it. When I pulled the prop shaft, it drained a load of water and then a bit of old gear oil and some tar. After spraying it with pb and beating on it for a while from various angles, I am happy to say the wheels actually engage now, and we managed to find all of the gears except reverse (manual shifting with rebar, a wooden stake, and a hammer). The shift forks are rusted up, and parts 1, 2, and 28-33 (diagram 69, manual 218-34p) are trashed, unsure on 27.

Oil has been changed, oil filter has been changed, oil sample taken from mid drain to send for analysis.

At this point, tranny is sitting open, carb is sitting on a shelf for disassembly, and put in orders for some magnets, a 5-gallon pail of evaporust, new u-joint for prop shaft, transmission gasket set, carburetor minor rebuild/gasket and o-ring set.

I am slightly past the halfway mark on my budget for getting it running/moving/stopping. So not too bad.
1967 United Tractor CN-40-A
1972 M109A3
1987 M105A2
19?? M151 Sand Rail (passed on to the next victim)

terratek
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Re: Weird project 151

Unread post by terratek » February 25th, 2019, 4:26 pm

Have a little time to work on carb rebuild.

Left it to soak for 24 hours or so, then brushed it off, and rinsed it, took it apart and have already ultrasonic'd the float bowl screws, accelerator pump screws, accelerator pump cover, float bowl, and all the jets and such I could remove. Accelerator pump diaphragm was rusty but cleaned up well, relaced it anyway as the soft kit had a new one. So bottom is clean and reassembled, now i am starting on the top.

Included is a picture, 2 things circled in red. Just wondering what the two things circled are. I suspect the one with the crimped off tube is for emissions (vapor scavenging) and the other is alternate fuel route?

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1967 United Tractor CN-40-A
1972 M109A3
1987 M105A2
19?? M151 Sand Rail (passed on to the next victim)

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Re: Weird project 151

Unread post by Surveyor » February 25th, 2019, 6:52 pm

Going by memory... Crimped portion usually has a brass fitting with two lines coming off. One to the pcv valve area and one around the front and down to a engine block in front of vacuum or fuel pump. Other circle is either capped off or the return to the fuel tank.
1960 M151 Run #1
"There is one nut on a M151 that is very difficult to remove....." - K8icu
"She ain't a Cadillac and she ain't a Rolls, But there ain't nothin' wrong with the radio" - Aaron Tippin
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rickf
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Re: Weird project 151

Unread post by rickf » February 25th, 2019, 6:53 pm

The one closest is a vapor return to the tank used on the A2 to prevent vapor lock. Not needed, the other is part of the PCV system and is supposed to have a two hole adapter in there to accept two lines. One would be the fresh air supply for the vacuum supply to the distributor vent system and the other is the supply for the crankcase fresh air return, part of the PCV system. You really should have the PCV system to balance out the carb. And prevent main seal leaks.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

terratek
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Re: Weird project 151

Unread post by terratek » February 25th, 2019, 7:13 pm

Bloody hell... So it looks like the pcv system (at this point in time) consists of everything except the fresh air source; the distributor vent system is currently capped as well.

I guess I will start with getting the carb working without leaking gas everywhere, then look for the fittings and tubing to redo those lines.

How necessary is the distributor vent and what purpose does the distributor vent serve? If the distributor has a vent, shouldn't it also have a filter attached somewhere? (looks like my dis has two lines that are plugged)
1967 United Tractor CN-40-A
1972 M109A3
1987 M105A2
19?? M151 Sand Rail (passed on to the next victim)

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Re: Weird project 151

Unread post by Surveyor » February 25th, 2019, 7:42 pm

1960 M151 Run #1
"There is one nut on a M151 that is very difficult to remove....." - K8icu
"She ain't a Cadillac and she ain't a Rolls, But there ain't nothin' wrong with the radio" - Aaron Tippin
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rickf
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Re: Weird project 151

Unread post by rickf » February 25th, 2019, 7:44 pm

No filter needed since the air is entering from the filtered side of the air cleaner and going from the distributor into the intake manifold. The reason te vent is there is to remove ozone from the inside of the sealed distributor housing that is produced by the high voltage sparks of the rotor to cap gaps. Otherwise the ozone will corrode the inner workings of the distributor.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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rickf
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Re: Weird project 151

Unread post by rickf » February 25th, 2019, 7:45 pm

Dammit Surveyor, Type slower!! :lol: :lol: :lol: :roll: :roll:
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

terratek
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Re: Weird project 151

Unread post by terratek » February 25th, 2019, 8:11 pm

lol yeah, probably should have searched first eh? My bad.

I'm just used to either having no vent as part of the pcv or having a vent and a filtered atmosphere line. I always thought the vented ones were to help balance out moisture intrusion, did not even think of hv ozone generation degrading anything. I also have not opened the distributor housing to take a look inside yet, will add that to the list of stuff I need to do.
1967 United Tractor CN-40-A
1972 M109A3
1987 M105A2
19?? M151 Sand Rail (passed on to the next victim)

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rickf
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Re: Weird project 151

Unread post by rickf » February 25th, 2019, 8:22 pm

Most old timers immediately think of the PCV system as "pollution equipment" and equate it to power loss. To the contrary, if you lower the internal engine pressure you actually pick up power. Plus on these engines the entire system is calibrated to use the PCV so taking it out will cost you power. And losing any of those 72 horse will be felt! Advancing timing past the 6 degrees marked on the wheel will also cost you power as will valves that are even the slightest out of adjustment. These are very fickle engines.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

terratek
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Re: Weird project 151

Unread post by terratek » February 25th, 2019, 8:37 pm

See, my immediate idea was to unplug the pcv and shove a filter on it, then unplug the distributor vent and toss a filter on it (i have some 1" filters laying around). But.... Problem for when it is running, added to the list of stuff: replace P.O. "enhancements".
1967 United Tractor CN-40-A
1972 M109A3
1987 M105A2
19?? M151 Sand Rail (passed on to the next victim)

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m3a1
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Re: Weird project 151

Unread post by m3a1 » February 25th, 2019, 8:54 pm

I think you will find that plumbing it correctly is not a very big deal. Take the time to look over some of the stuff on the site (this ground has been plowed many times before) and you can search topics by keywords. And of course there are the manuals (top right of the page).

terratek
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Re: Weird project 151

Unread post by terratek » February 25th, 2019, 9:50 pm

Have the manuals (waiting on a printed one), and... I completely agree with you. Only reason I thought about the filters is.. have 'em, don't have a use for 'em atm, and the entire project right now is just to get it running, moving, and stopping before I drop more money into it.

As of right now, I have a little over 492 left to drop into it before I consider it a money pit. The main criteria to hit within that 492 (1k total) are:
1) starts (done, starting fluid; idled on starting fluid)
2) idle for 15 minutes without overheating or leaking everywhere
3) moves under it's own power (done, both drive shafts turned, front connected drive shaft spun wheels properly)
3.1) addendum: would like to see it move on the ground, but I am considering 3 (above) a win
3.2) addendum: starting in first gear due to a trashed clutch is ok in my book :P
4) stops without flintstoning
5) addition: basic lighting working.

My dad was released from the hospital recently, so i am keeping an eye on him and up all night again. I have appointments starting thursday to basically be in a bunch of pain, so am trying to get the carb knocked out before then and get some work around the house done. Will check before then, and probably be semi incommunicado for a week or so starting thursday.
1967 United Tractor CN-40-A
1972 M109A3
1987 M105A2
19?? M151 Sand Rail (passed on to the next victim)

terratek
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Location: San Antonio, TX & Terlingua, TX

Re: Weird project 151

Unread post by terratek » May 27th, 2019, 7:15 pm

Apologies for lack of updates, have been busy with home / medical stuff and working on my jeep zj. I will get back to this project once things settle down again.
1967 United Tractor CN-40-A
1972 M109A3
1987 M105A2
19?? M151 Sand Rail (passed on to the next victim)

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rickf
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Re: Weird project 151

Unread post by rickf » May 27th, 2019, 7:18 pm

That's ok, Your helper, TJ, has bailed on us to become a biker. So you are not the only one who has not been around. :lol: :lol: :twisted: :twisted: :twisted:
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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