Mopar Mechanic Needed

[MATT47025]

So as some of you know I just purchased a 51 B3C. My dad is an excellent Mechanic and we are having some trouble with this one. 

We have replaced the following:

Plugs, Plug wires, Spark Plugs, Fuel pump and lines, Points, Condenser, Rebuild Carb., button and cap.

It is still on A 6volt System but we have been trying to start with a 12v battery (12v coil) and It almost starts 

but never does. It pops and backfires a bit. We checked the timing and its okay. We plan on doing a compression

test as we think we may have a valve issue. Any ideas? 

[Plymouthy Adams]

^{one of the first things one should do acquiring these old cars is take a general assessment of the engine's heath. Compression  test should always be at top of list....given that is ok and all other things listed done....verify the static timing and be sure you are firing TDC and not 180 out....and if that is ok..check to see if you bought the right parts for the right distributor....you need always check to see what distributor model in in our engine..you can never assume as it could well have been changed over the years....buy your cap and rotor by model number...}

Edited April 26, 2015 by Plymouthy Adams

[NiftyFifty]

Sounds like it's off 180 but PA is right...stuck valves can mean no compression, meaning firing and running issues. I also messed up my first time on firing order, was off a spot on the cap.

[52b3b Joe]

The last time I had this exact same problem, it turned out to be a weak coil...just a thought. Like others said though, check the compression, and make sure the valves are adjusted. 

[MATT47025]

Hey guys, well here is an update. Compression test, #1(100) #2(100) #3, #4, #5,(0) and #6(60)

Looks like we will be pulling the Head soon. 

[Jeff Balazs]

Before you do that .....why don't you just remove the valve inspection covers and try to free the sticking valves up? Sometimes all it takes is some penetrating oil and a bit of working them. Chances are they are just stuck.

 

Jeff

[MATT47025]

Hey Jeff

 

Well we tried that with our '50 as it had stuck valves also. It didnt seem to work but you know we may give that a try first.

[MBF]

Good luck.  I had one like that years ago-got it running on 2 cylinders, and two or three more came loose with Marvel Mystery oil, but we did end up pulling the head to free them up.   I run a little Marvel Mystery Oil in the crankcases of all my flatties.   Some think its snake oil, but I've got two Gravelys that will hang valves while running if it isn't added to the gas.  

Edited April 29, 2015 by MBFowler