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View Full Version : Glow plugs for 12 grader 8T....????



muzz
10-09-2012, 07:59 AM
I have a 1948 CAT 12 grader serial number 8T2070. I have already put a 24v starter and charging system on it. I also still have the pony engine on it that runs. After a failure of the pony clutch pinion gear and sleeve, I was thinking of taking that money and putting it into glow plugs. Does anyone know for sure if I can buy pre-cups that are glow plug ready for this machine?

If not, what other options are there for a intake heater or something like that?

Thanks,
Muzz

Old Magnet
10-09-2012, 06:04 PM
Requires some rework.....
The early heads (prior to 1952) have the small bore diameter pre-com chambers. They heads would need to be bored out to take the later 1S1970 one piece glow plug chambers with 3H2033 glow plugs, 6F8061 retainer nuts and the shims to index glowplug location.

or

Find some later heads casting #7F7878.

muzz
10-09-2012, 08:47 PM
thanks old magnet. So would that be 8T14782 and up to get past 1952 and the head design?

Muzz

Old Magnet
10-09-2012, 09:25 PM
My list for the 8T shows 1952 to be s/n 9001-11,130.
Any D318 with the casting # I mentioned would work

drifter
10-12-2012, 04:06 AM
I would like to know your starter # and if it would fit the 1958 grader. Thanks Jim
I have a 1948 CAT 12 grader serial number 8T2070. I have already put a 24v starter and charging system on it. I also still have the pony engine on it that runs. After a failure of the pony clutch pinion gear and sleeve, I was thinking of taking that money and putting it into glow plugs. Does anyone know for sure if I can buy pre-cups that are glow plug ready for this machine?

If not, what other options are there for a intake heater or something like that?

Thanks,
Muzz

muzz
10-12-2012, 09:49 PM
Jim,

I'm using a delco mt 42. It will fit yours.

Muzz

ol Grump
10-13-2012, 08:12 AM
When I took the mosquito killer "buzz bomb" pony off my 12E and added an MT 50 starter I kept the original 12 volt system and just added another battery. I'd thought about going with glow plugs but would have had to change precoms as well as having to go to a 24 volt system. This would have meant that the voltage would have to be stepped down for the lights, defroster fans and heater. Instead I worked out a home made "hot shot" ether setup and plumbed that into the intake tube between the air filter and manifold with small plastic tubing.

The drill I use is to release compression on the engine and crank it for 8-10 seconds to build oil pressure, then go to compression, kick the throttle and push the button on the ether can for half a second. Rumbles right to life, even down to 20F. While it may not be original, it is functional :lol:

That reminds me, in a couple of weeks it's going to be time to chain the critter up for winter. . .

muzz
10-15-2012, 03:13 PM
My list for the 8T shows 1952 to be s/n 9001-11,130.
Any D318 with the casting # I mentioned would work

I found that the serial number cut off is 8T11040 for the smaller precombustion chambers (2.15") and after that uses the larger 2.4".

muzz