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Antique Autos and Trucks

Mack Bulldog


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  #21  
Old 11-18-2017, 06:33:32 PM
Jack Innes Jack Innes is offline
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Default Re: Mack Bulldog

As I understand it the logo cast into the engine & most castings is an M with an I in the middle of it, standing for "Mack International". Even after they changed the company name in 1922 to "Mack Trucks Inc." they retained the MI logo on the hood of the AC as well as on many castings.
Some castings, like the wheels on the 27, have the MACK script cast into them.
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  #22  
Old 11-19-2017, 06:21:22 AM
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Marcel P Marcel P is offline
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Default Re: Mack Bulldog

What a great truck! Very hard to find these days and in this condition. I cannot see it in the pictures but I suppose the tyres are vulcanised on steel rings that are pressed onto the wheels? If you can find some used forklift tyres it is fairly easy to bolt these on the rings once these are pressed off the wheels. Here are some pictures of the procedure. This was done with segments that came off a traction engine.

Regards
Marcel
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  #23  
Old 11-22-2017, 03:39:22 AM
Jack Innes Jack Innes is offline
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Default Re: Mack Bulldog

A bit of progress - I just found & ordered the correct Adlake tail light for the MACK AC. I have had the matching side lights for over 40 years.

https://www.lanternnet.com/Merchant2...72_568x675.jpg
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  #24  
Old 11-29-2017, 01:46:01 PM
Jack Innes Jack Innes is offline
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Default Re: Mack Bulldog

We had a mild day yesterday so I was able to do some work on the MACK. I made an adapter for the crank attachment & connected a gear reducer that I often use on new rebuilds or engines that have set for decades. The shaft turns at 30 rpm & helps free up stuck rings, valves, etc. So far the mag is working with the impulse acting & I have compression on 2 cylinders. There likely are sticky valves in the other 2. I let it roll over for about an hour & now that there is some compression the electric motor will stall unless I remove the plugs. The rig is obviously not strong enough to start the engine. I have adaptors for many smaller engines & it does start the smaller units. The MACK is 471 cid (5" bore, 6" stroke) so it is asking a lot to turn it under compression.
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  #25  
Old 12-01-2017, 08:17:45 PM
Jack Innes Jack Innes is offline
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Default Re: Mack Bulldog

With more rotating & by turning the valves from below I now have compression on 3 cylinders. #4 exhaust valve is leaking badly & may need work. Does anyone have any suggestions on removing the valve plugs that have been in place for 50 years? The plugs have a straight thread & a copper gasket.

Jack
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  #26  
Old 12-02-2017, 07:14:57 AM
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Default Re: Mack Bulldog

Most times, you can get by with simply using a bar to loosen them. Sometimes, though, you need a special wrench and some careful "percussion therapy" to get them to break loose.
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  #27  
Old 12-02-2017, 12:09:05 PM
Jack Innes Jack Innes is offline
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Default Re: Mack Bulldog

Thank you Elden, I have tried a bar & hammer but no luck. I am heading out to the shop to make a wrench.

Jack
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  #28  
Old 12-02-2017, 01:54:00 PM
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Default Re: Mack Bulldog

If you have an old broken or worn out socket laying around you could always weld a crossbar to it and use an impact wrench with the setting turned down lower.

Don't want to risk stripping the threads or breaking things but with the impact turned down lower it will still give it a light to moderate constant jarring motion in the right direction. Start low and slowly open the valve to where-ever you feel comfortable.

That couple with some good penetrating oil and or a light heating should get them out.

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  #29  
Old 12-02-2017, 07:28:55 PM
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Default Re: Mack Bulldog

i to find the impact on LOW will help alot with buildup. also i swear by ATF and acetone for penetrating oil. just need to shake real good, it likes to seperate.

also sometimes tighten first, then loosten.
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  #30  
Old 12-02-2017, 09:09:25 PM
Jack Innes Jack Innes is offline
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Default Re: Mack Bulldog

I spent the afternoon at the lathe & mill & am ready to try the impact tomorrow. The threads have been soaking in ATF/Acetone.

The 3/4 to 1/2" adaptor is a press fit in a square hole milled in the piece.
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  #31  
Old 12-02-2017, 09:17:02 PM
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Default Re: Mack Bulldog

Excellent fabricobbling! I'd heat the OD of the head area before reefing on it just to hopefully loosen the rust hold on it.
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  #32  
Old 12-03-2017, 03:35:43 PM
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Default Re: Mack Bulldog

If you cross drill that adaptor you can stick a bar through it for a handle to apply pressure in the direction you want to go with it along with the impact guns raps in that direction.

Kind of like giving an arbor press a whack on the top of the ram while applying pressure.

Might come out easier than you think that way.

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  #33  
Old 12-03-2017, 04:02:34 PM
Jack Innes Jack Innes is offline
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Default Re: Mack Bulldog

With the wrench, a little heat & lubrication I removed 4 of the plugs today!!
I used an electric impact gun that is a little less brutal than the air type. The plugs went hard all the way but did come out.

As I expected the exhaust valve in #4 cylinder is burned. Possibly from being left open for years then run with rust on the faces. The seat looks good & is an insert so perhaps it has been replaced at some time.

Now I need to find 4 or maybe 8 valves with a stem at .490", overall length 10.4" & the head 2.25 diameter.
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  #34  
Old 12-04-2017, 05:32:05 PM
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Default Re: Mack Bulldog

I just finished pulling an intake valve out & found that it is essentially the same size as the exhaust valve. It is in useable condition so I will likely just need the exhaust valves.

I found Toledo part numbers on both valves; in. T307, ex. S290 (the 9 could be a 0). So far I have not found any listings for Toledo valves.
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Old 12-04-2017, 09:10:54 PM
Mark Schneider Mark Schneider is offline
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Default Re: Mack Bulldog

Intake valves have a much easier life as they cooled by the incoming fuel/air charge. As old as your truck is it's probably a really long shot to find NOS exhaust valves for it. Try H&J Machine here in Carrington ND as he has an excellent selection of both obsolete valves and valve blanks. If he hasn't got what you need he can probably whittle you out a set. Contact information is on the Sponsor list.
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  #36  
Old 12-04-2017, 09:29:38 PM
Jack Innes Jack Innes is offline
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Default Re: Mack Bulldog

Thank you Mark. I have already contacted H&J & they got right back to me with a blank that they can make work. It is great to find a company that will respond in good time.

I will pull the rest of the valves & make sure what is needed & send H&J exact measurements. I also need a set of 4 valves for a Reading Standard motorcycle so hopefully they can make them at the same time.

Jack
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  #37  
Old 12-05-2017, 08:48:27 AM
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Default Re: Mack Bulldog

Jack- you mentioned using the ATF/acetone mix that i mentioned i swear by.

is that what u always use??? or did u just decide to try it.

was just wondering, everybody has their own special concoction, thanks Ed.
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  #38  
Old 12-05-2017, 10:24:42 AM
Jack Innes Jack Innes is offline
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Default Re: Mack Bulldog

Ed, I have been using the ATF mixture for a few years with good success on stuck engines. A couple of years ago I soaked an Associated Hired Man cylinder with it & got the piston out in useable condition. The engine had been in a basement that flooded, totally submerging the engine, every spring for 60 years!

Jack
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  #39  
Old 12-05-2017, 02:01:02 PM
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Default Re: Mack Bulldog

Jack-after that being said, i will stick w/the ATF. always looking for a better solution, keep up the nice work, thanks Ed.
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Old 12-08-2017, 02:55:11 PM
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Default Re: Mack Bulldog

H&J will have the valves for the MACK and a set for my 1919 Reading Standard motorcycle done on Tuesday. Great people to deal with!

Jack
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