Cat D4_What is the Spark Plug for ?
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Topic: Cat D4_What is the Spark Plug for ?
Posted By: BuckSkin
Subject: Cat D4_What is the Spark Plug for ?
Date Posted: 19 Jun 2020 at 10:55am
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I found a Caterpillar D4 (7U) Bulldozer_1947-1959 sitting in weeds and briars over my head; it has been there a long time. Due to the thick/tall weeds, the location, and the terrain, I could not get any good detailed shots. Back home and looking at the pictures, I can see what is definitely a single spark-plug, complete with a plug wire, located on the right side, rear of the engine. The engine is a D315 diesel and definitely has a big electric starter. In all the specifications I have read, there is no mention of a pony engine. What purpose does the spark-plug serve ? Thanks for reading and all help is appreciated. |
Replies:
Posted By: NomoreJohnDeere
Date Posted: 19 Jun 2020 at 11:11am
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If it has a pony it would have two spark plugs It may have had electric start added and retained the pony ------------- HD3 |
Posted By: Ray54
Date Posted: 19 Jun 2020 at 11:21am
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Well into the 1960's the pony motor was the preferred stating method of Cat. The D315 was replaced in the late 1950's. Somewhere in the mid 1950's most Cat engines did have place for a direct start starter machined in at the factor. As direct start was used on generators, marine, and industrial applications. So today not uncommon to find a pony motor and direct electric start on the same machine. Pony motor parts are getting pricey so cheaper in many cases to put direct start on than fix the pony. But still many Cat fans that think a pony is the only way to do it.
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Posted By: BuckSkin
Date Posted: 19 Jun 2020 at 11:54am
If that be the case, would the second plug be on the other side of the machine where I could not see it ? I am taking some napalm and some Asian Orange and a flame-thrower and a sling-blade and making another trip to get more serious about getting some good detail pictures. It is a good sixty or miles from me. I have seriously considered taking a lo-boy and just bringing it to the house. I also found a Autocar with a Bucyrus-Erie cable well rig, buried so deep in the vines that I doubt a big dozer could pull it free; after seeing it, I just can't get it out of my mind; I would feel better knowing it was sitting out back here. |
NomoreJohnDeere wrote:Posted By: ac fleet
Date Posted: 19 Jun 2020 at 12:44pm
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second plug is on the opposite side of them. --the 4 starting engine is kinda pancaked around the back of the engine and not on the left side like D-7's are/were. ------------- http://machinebuildersnetwork.com/ |
Posted By: DMiller
Date Posted: 19 Jun 2020 at 1:04pm
| More like the Motor Graders with the Opposed cylinder engine at the top of the Bell Housing. |
Posted By: NomoreJohnDeere
Date Posted: 19 Jun 2020 at 6:10pm
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yes, one on the other side also a gas filler cap thru the hood and another exhaust thru the hood for the pony, or a hole for one the rope start pulley is under the air cleaner at the operators feet ------------- HD3 |
Posted By: BuckSkin
Date Posted: 19 Jun 2020 at 8:09pm
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You guys must know your Cats pretty good. I do see what must be a gas cap; right-rear corner of the hood, just ahead of the air-cleaner. Actually, there are two caps there, one an each side of the hood; the one on the right looks more like a gas cap, while the one on the left is sort of weird looking. The main exhaust, right side about midway, is a big tall mufflered affair with one of those big flappers on it. Directly across from the main exhaust is a short pipe sticking up with an old Dr. Pepper can turned bottom-side-up over it; I can't determine from the pictures whether this pipe sticks through the hood, or up beside it. At the rear of the engine, down under the air-cleaner, is a large grooved pulley held on by a huge nut; I guess maybe this is for wrapping a starting rope around; is that the way these worked = manually wrap the rope and the rope come free of the mechanism once it is pulled? One curious thing about the spark-plug that I do see is that, instead of it being a decrepit rusty affair, it looks as if it were taken new out of the box last week. |
Posted By: DiyDave
Date Posted: 19 Jun 2020 at 8:41pm
------------- Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need! |
Posted By: NomoreJohnDeere
Date Posted: 19 Jun 2020 at 8:54pm
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pony air cleaner is it's own oil bath unit on same side as fuel tank. the other pipe thru the hood is the oil fill for the pony. ------------- HD3 |
Posted By: DiyDave
Date Posted: 20 Jun 2020 at 4:58am
I stand corrected. Its been a long time since I saw the D-4 my grandfather used to have. Someone prolly lost the oil pipe cover and added the pop can, to keep the water out. I also forgot that the pony's exhaust is piped into the exhaust manifold of the cat motor, to transfer heat to it, to make starting easier!  ------------- Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need! |
Posted By: DMiller
Date Posted: 20 Jun 2020 at 6:19am
| Been a LONG time since used a Pony start, be a LOT Longer for me to ever use one again!! PITA to keep viable with the junk gas have now. |
Posted By: NomoreJohnDeere
Date Posted: 20 Jun 2020 at 9:05am
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pony exhaust piped thru intake manifold to warm it it transfers heat thru sharing water jackets ------------- HD3 |
Posted By: SteveM C/IL
Date Posted: 20 Jun 2020 at 10:10am
| always disliked the pony on the twp grader but will admit the concept was a good one for cold weather operation. If you succeeded getting the pony running,you could warm up the big ol diesel by just waiting.....no ether needed!!! |
Posted By: JC-WI
Date Posted: 21 Jun 2020 at 12:29am
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D4 7U   [TUBE]bS0BDcAqfm4[/TUBE] Starting proceedure ...D2,D4, D6 [TUBE]Jcz7qPz8QTE[/TUBE] D4 5T Side fuel tank   ------------- He who says there is no evil has already deceived himself The truth is the truth, sugar coated or not. Trawler II says, "Remember that." |