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Antique Autos and Trucks

Mack Bulldog


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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
Jack Innes Jack Innes is offline
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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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  #35  
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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  #40  
Old 12-08-2017, 02:55:11 PM
Jack Innes Jack Innes is offline
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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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