742B squirrel fan and timing covers

[Scott Cee]

I pulled the engine out of my 742B for overhaul, and the squirrel fan shroud is umm, not so great.

I'm thinking I'll patch it with some aluminum sheet and screws/nuts, if that seems reasonable?

Also, I'm assuming there was supposed to be a cover over the big rectangular opening above there? It was just open.

The machine obviously was overheated at some point. I'm struggling with the idea of overheating it enough to melt that shroud, but I guess so. There was no thermostat in it, and the radiator has some repairs on it.

Also the upper timing belt cover was just missing, and the lower one is all deformed, I'm guessing the heat also got it. Other than losing the ignition timing marks, which I think I can work around with a dialback timing light (I have a fancy one for setting up propane), is there any reason I can't just ditch them? They're NLA from Bobcat and I don't think I'll have much luck finding them used.

You can see where the belt was rubbing it even. Plus the head of a broken bolt, but that's another story.

 

[Scott Cee]

Has anyone ditched the whole squirrel fan setup and just put a couple electric fans in on the radiator/hydro cooler? I can throw the fan on my lathe and remove the blades and balance it, but that's the sort of mod there's no going back from.

 

[Dave1234]

Yes, there is a thick sheet metal piece that sits at a slant covering the opening above the fan shroud to assure that all the air must go through the Hyd oil cooler and/or the radiator. Should be pretty easy to fabricate. (FYI, Mine was a little tight to get in and out with the radiator hoses in place, but doable).

And, if it were me, like you I would also plan on sheet metal patches to more or less duplicate the shroud where damaged. There are still some 4g32 engines in wrecking yards. I'd try to get the timing covers via that route. Some 4g32s had a timing chain, others a belt. The chain version won't have similar covers. And some had dual cams. They may not work either, not sure. Don't know about the silent shafts version. Look for ~ 77-80 Dodge Colt or similar car. It will probably have to be a rear wheel drive version.

 

[Scott Cee]

Yes, there is a thick sheet metal piece that sits at a slant covering the opening above the fan shroud to assure that all the air must go through the Hyd oil cooler and/or the radiator. Should be pretty easy to fabricate. (FYI, Mine was a little tight to get in and out with the radiator hoses in place, but doable).

And, if it were me, like you I would also plan on sheet metal patches to more or less duplicate the shroud where damaged. There are still some 4g32 engines in wrecking yards. I'd try to get the timing covers via that route. Some 4g32s had a timing chain, others a belt. The chain version won't have similar covers. And some had dual cams. They may not work either, not sure. Don't know about the silent shafts version. Look for ~ 77-80 Dodge Colt or similar car. It will probably have to be a rear wheel drive version.

I don't know if the Colt has the same timing cover or not. It does not have the same timing belt and pulleys. It may have counterbalance shafts too, which would probably make everything different. I have a gasket kit from one that I was going to see if it is the same on the cover, if it is then the covers are probably the same or close enough. Assuming it is the same, were still looking at finding a part for a 40 year old car that wasn't very popular, not to say it can't be done.

The other piece I realized is missing, or so I assume, is a divider between the radiator and muffler. Simple to make, but annoying that somebody would be so lazy as to not put it back in.

 

[Dave1234]

Can you share your parts details/sources for your overhaul?

 

[Scott Cee]

Can you share your parts details/sources for your overhaul?

I will when I know more. Currently, I don't know exactly how we're going to fix this thing. I plan to provide something of a write up when it's all said and done, because unfortunately a lot of the information is either incomplete or confusing, and it would be nice to clear some things up.

 

[brdgbldr]

Here is a list of the cars that used the 4G32. It came from this website: https://www.enginenumbers.com/motorcode/4g32/

Also, don't forget that the 4G32 was used in forklifts.

At this time, our records show that the 4G32 was used in the cars listed below:

Car brand	Model	Model years
Mitsubishi	Colt Celeste 1.6	1975-1981
Mitsubishi	Cordia 1.6	1982-1984
Mitsubishi	Galant 1.6 Lim.	1980-1984
Mitsubishi	Galant III 1.6	1984-1987
Mitsubishi	Galant Sapporo 1.6	1978-1980
Mitsubishi	Galant Sigma 1.6	1976-1980
Mitsubishi	Galant Sigma 1.6 Kombi	1979-1980
Mitsubishi	L 300 1.6	1982-1986
Mitsubishi	L 300 1.6 Kleinbus	1980-1986
Mitsubishi	L 300 1.6 Kleinbus	1980-1986
Mitsubishi	L 300 1.6 Kombi, Kleinbus	1980-1986
Mitsubishi	L 300 II 1.6	1987-
Mitsubishi	Tredia 1.6	1982-1984

 

[brdgbldr]

Don't forget that you can look at all of the schematics in the parts catalog:

Bobcat Parts Catalog - Find Diagrams for Your Equipment - Bobcat Company

Locate all parts and component information about your Bobcat equipment with detailed visual diagrams and illustrations with parts numbers and add to your list.

partscatalog.bobcat.com

 

[Scott Cee]

Here is a list of the cars that used the 4G32. It came from this website: https://www.enginenumbers.com/motorcode/4g32/

Also, don't forget that the 4G32 was used in forklifts.

At this time, our records show that the 4G32 was used in the cars listed below:

Car brand	Model	Model years
Mitsubishi	Colt Celeste 1.6	1975-1981
Mitsubishi	Cordia 1.6	1982-1984
Mitsubishi	Galant 1.6 Lim.	1980-1984
Mitsubishi	Galant III 1.6	1984-1987
Mitsubishi	Galant Sapporo 1.6	1978-1980
Mitsubishi	Galant Sigma 1.6	1976-1980
Mitsubishi	Galant Sigma 1.6 Kombi	1979-1980
Mitsubishi	L 300 1.6	1982-1986
Mitsubishi	L 300 1.6 Kleinbus	1980-1986
Mitsubishi	L 300 1.6 Kleinbus	1980-1986
Mitsubishi	L 300 1.6 Kombi, Kleinbus	1980-1986
Mitsubishi	L 300 II 1.6	1987-
Mitsubishi	Tredia 1.6	1982-1984

Most of those cars were not sold in North America, or if they were it was incredibly rare. All of the ones used in Mitsubishi branded cars appear to have balance shafts and higher CR pistons. The Dodge Colt has balance shafts from what I understand, I found pictures of a timing belt "kit" for it and it comes with components that aren't the same, which suggests there is something else being driven by the belt, or the pictures were wrong. Looking at verified pictures of the cam gear, oil pump gear, and crank gear, plus the belt, they are profiled differently and possibly a different width. I've found references online that the valves aren't the same either, I think mine are okay so hopefully I don't need them, but there is some Colt valves available. Soooooo, I don't think much actually crosses over out of the available parts. There is crank and rod bearing kits available for the Colt though, and probably cam bearings, which should all be the same. Also rings, but they may possibly not be the same, it is a little hard to guarantee when a different piston was definitely used. I don't know if I'm going to try to buy forklift pistons (they are available) or if we will throw a sleeve in the worst cylinder. I can buy sleeves for very little money ($40~ each), but I am waiting on the machine shop before I buy anything. I want them to tell me what they think and what their distributor has before I go throwing money on sketchy parts. One of the old guys there seemed to think it was going to be no big deal, the other one looked at it with visible disgust, so either they can source everything or nothing.

As I said, the information available is incomplete and confusing.

 

[brdgbldr]

I sold my 742B and most of the extra parts I had a couple of years ago. I gave the new owner most of my resource materials also.

The whole issue with finding parts for the 4G32 has been going on for years in this forum. I wish we could get all the info in one place but I have also noticed that I can't find some of the old posts anymore.

Not sure if you have tried or not, if you haven't, search the forum for "4G32" and then also "642B" and "742B". There is a lot of good information but sometimes you have to dig for it.

There are places that still rebuild these engines. You may be able to source parts through them. Here are just a couple.

All States Ag Parts | Used & New Tractor, Combine & Skid Steer Parts

All States Ag Parts is the leading supplier of tractor, combine, and skid steer parts to North America. Shop for new aftermarket, remanufactured, and used tractor parts.

www.tractorpartsasap.com

Hydraulic Pumps & Drive Motors > Bobcat, Case, John Deere, New Holland, Scat Trak, and more! | Loader Parts Source.com

Quality skid steer parts for Bobcat, Case, John Deere, New Holland, Scat Trak and more. The source for all your skid loader parts needs.

loaderpartssource.com

Mitsubishi 4G32 Engine - FORKLIFT ENGINES - Lift Parts Warehouse

Find the right Mitsubishi 4G32 Engine parts faster at Liftpartswarehouse.com. Browse Search By Category - FORKLIFT ENGINES - Mitsubishi to find what you are looking for. Speedy delivery available 24/7.

www.liftpartswarehouse.com

 

[Dave1234]

Here is a list of the cars that used the 4G32. It came from this website: https://www.enginenumbers.com/motorcode/4g32/

Also, don't forget that the 4G32 was used in forklifts.

At this time, our records show that the 4G32 was used in the cars listed below:

Car brand	Model	Model years
Mitsubishi	Colt Celeste 1.6	1975-1981
Mitsubishi	Cordia 1.6	1982-1984
Mitsubishi	Galant 1.6 Lim.	1980-1984
Mitsubishi	Galant III 1.6	1984-1987
Mitsubishi	Galant Sapporo 1.6	1978-1980
Mitsubishi	Galant Sigma 1.6	1976-1980
Mitsubishi	Galant Sigma 1.6 Kombi	1979-1980
Mitsubishi	L 300 1.6	1982-1986
Mitsubishi	L 300 1.6 Kleinbus	1980-1986
Mitsubishi	L 300 1.6 Kleinbus	1980-1986
Mitsubishi	L 300 1.6 Kombi, Kleinbus	1980-1986
Mitsubishi	L 300 II 1.6	1987-
Mitsubishi	Tredia 1.6	1982-1984 Most of those cars were not sold in North America, or if they were it was incredibly rare. All of the ones used in Mitsubishi branded cars appear to have balance shafts and higher CR pistons. The Dodge Colt has balance shafts from what I understand, I found pictures of a timing belt "kit" for it and it comes with components that aren't the same, which suggests there is something else being driven by the belt, or the pictures were wrong. Looking at verified pictures of the cam gear, oil pump gear, and crank gear, plus the belt, they are profiled differently and possibly a different width. I've found references online that the valves aren't the same either, I think mine are okay so hopefully I don't need them, but there is some Colt valves available. Soooooo, I don't think much actually crosses over out of the available parts. There is crank and rod bearing kits available for the Colt though, and probably cam bearings, which should all be the same. Also rings, but they may possibly not be the same, it is a little hard to guarantee when a different piston was definitely used. I don't know if I'm going to try to buy forklift pistons (they are available) or if we will throw a sleeve in the worst cylinder. I can buy sleeves for very little money ($40~ each), but I am waiting on the machine shop before I buy anything. I want them to tell me what they think and what their distributor has before I go throwing money on sketchy parts. One of the old guys there seemed to think it was going to be no big deal, the other one looked at it with visible disgust, so either they can source everything or nothing. As I said, the information available is incomplete and confusing. There are a lot of relevant and useful details about the 4g32, when silent shafts were brought on, rear wheel drive vs front wheel drive motor, etc. that can be extracted here: https://en.wikipedia.org/wiki/Dodge_Colt

 

[mike_belben]

I deleted the fanwheel and shroud junk and fabbed a puller fan on the outside of the machine using jeep cherokee fan. It worked fine. Ford kent powered 1.6L 742b. Im here researching repowers myself and looking for pics of the fanwheel and pump joint because i didnt take any pics when i did it

 

[Scott Cee]

I deleted the fanwheel and shroud junk and fabbed a puller fan on the outside of the machine using jeep cherokee fan. It worked fine. Ford kent powered 1.6L 742b. Im here researching repowers myself and looking for pics of the fanwheel and pump joint because i didnt take any pics when i did it

That's good to know. I wound up just fixing the shroud and making a new cover plate for it, and it works totally fine. To do this all over I would just repower the machine, it would be quite easy knowing you could ditch the mechanical fan and go electric. I would look at a rubber/elastomeric coupling like what is used for a pump drive on an excavator instead of the ujoint setup, as you do not need to grease them.

Also, for anyone that might care regarding the timing covers, I threw them out and it is fine without them. I just used a dial back (well, digital) timing light to set the ignition timing, which is the better way to do it anyway. I did put some expanded steel (heavy duty mesh) over the vent holes on the engine access door, just to keep leaves and stuff out. I mean to still put some over the air intakes on the side of the cab.