Yes for the starter, alternator/charging system, temp guage (although the guage and the sensor I'm using are not calibrated to each other, but using a series resistor brings it inline at the 200 F point), but no for the oil pressure. The B3.3T runs very high oil pressure and destroyed two electrical oil pressure sending units so I went to a mechanical pressure guage setup.

The only time the fan has kicked on was during a warm winter day when I had the radiator blocked with cardboard and was running at interstate speeds into a big headwind and my EGT's were in the 900-1100F range for an extended period. I have the electric fan setup to kick on when its temp sensor reads ~200 F (it has it's own probe). Except for that one time it's never gotten hot enough to kick on. There's about 6 inches between the radiator and the front of the engine so there's not much restriction to airflow. I'm using a stock 6 cylinder jeep radiator. If you put a front mount intercooler on it may limit airflow and cause the fan to run more often. It would be good to hear 3.3Sonoma's experience with his radiator/cooling system.

I don't have a block heater. The jeep stays in an attached garage that rarely gets below freezing in the coldest of the iowa winter.

You're going to post pictures aren't you

 

I took my factory wiring harness and a wiring diagram and removed everyting I did not need. Mostly ignition and emissions related. I am still using the factory engine and body control modules. I used the sensors from the existing gas engine and put them in the 3.3. All of my factory guages still work except the tach. Had to keep the ecm because all the sensors route throu it to the dash.
As for cooling I just installed a 15" electric fan this past weekend. My radiator is a singe core maybe 3/4" thick radiator(stock from 4.3 v-6). I have not driven the truck with outside temps above 65 yet so fan does not come on. I do sit in traffic ALOT so I am sure I will need it over the summer.
As for oil pressure you are right. My factory guage is pegged over 80 psi when cold. After warmup reads 80psi at crusing speed 60~65 at idle.

 

Cool. Was there any possibility to use the jeep sensor? I haven’t looked at it yet. For the oil I may take a look around the plant and see what types we use. I think we mostly use low pressure switches. I’m thinking I could just wire it to the check engine indicator on the jeep. Got to find the rating for the bulb though. I am definitely going to need help on the alternator wiring, but I won’t bug you with this until I dig a little.

That is what I want to do 3.3 Sonoma keep most of what is existing. I hope the jeep gauges are not dependent on the ECU. That is going to be sold with the engine.


When you mention warm summer day what temp. Just curious as to how big I need. Looks like there is no need for a large fan. I think I am going to build a housing for the radiator/ fan. It will bring it closer to the engine and I won’t have to reconfigure anything if I lift the truck. Also it would leave plenty of room in front for a cooler.

Thanks for the help. Hopefully I will have the 4.0 sold today. I have a tranny coming sometime in the next two weeks. I have done most of my mount prefab. Looking for the correct pulley / belt for hydro pump. So hopefully in a couple of weeks I’ll be on my way. I will start posting pics shortly.

 

I also have some part#s at home for the cummins adapter plates for running a pump on the front cover gear drive.
I had plans to add power steering this way and use a pump for a medium duty truck engine. If I recall a pump from a 3126 cat would work. This was going to be a somewhat cost prohibitive route $500~$600 guessing.
I used a manual steering box i got from a buddy for $50. Works great for highway driving slight pain around town.
My stock saginaw pump from my 4.3 was just to big with the itegrated reservoir. I could probably use a new style gm pump with remote reservoir but don't feel it is worth the extra work.
The one accesory I would like to get working is the A/C. Once again factory unit to large with bolt on hard line section. Might try an aftermarket compressor. Not to excited about trying to add a second pulley on the crank to drive it but guess I will se what I can figure out.

 

I stopped at the PTO drive parts the gear and shaft assembly costs over 200. So I canned the idea. For the offroader the possibilities are endless for a PTO set up like that, put pricy. The Jeep pump looks like it will work nicely. It has the remote reservoir. Do your engines already have the PTO gearing installed, mine just has the housing and a cover plate.

 

Not sure which sensor you're refering to.

For the alternator wiring (like most of the wiring) what I did was look where things were attached before removing the gas engine and label them and then re-connect to the diesel. The alternator was really easy. Getting the tach to work was a little more difficult because I had to find which wires ran to the tach and then connect those into the Dakota Digital tach box.

There are a lot of sensor wires that are hanging open in my engine bay because there's no compatible place to connect to with the diesel. I have a constant check engine light on so I have black tape covering it up :-)

The oil pressure sending unit from the jeep's engine fit into the port for the B3.3T and is what I used at first. Like 3.3Sonoma it pegged the indash gauge for the first month or so and then slowly started to give erradic measurements. Bought a new unit and it worked for awhile and then died the same death. The mechanical gauge has been working great for over a year.

The engine coolant sensor had different thread sizes than the B3.3T block so couldn't reuse it. I found one that was thread compatible with the block but not calibrated with the gauge. Was able to make it calibrated at nominal engine operating temps (~200F) by using a series resistor of the correct size (don't remember the value).

The fan hasn't kicked on in the summer, it was in the winter with the radiator blocked with cardboard. It hasn't kicked in any other time. At first I thought the sensor to the electric fan wasn't working but since it's an adjustable unit I can turn the **** to make it kick on at 180F and it will run then. The engine is very efficient and has a low heat rejection, and there's ample room in my engine bay so the ambient air flows through the radiator very well. Even in traffic the heat from the engine bay flows up through the hood scoop making a convection current which dissipates the heat well (I've got a thermometer probe on top of the intercooler that measures the temp of air going into or out of the scoop).

 

Use of adapters wasn't possible I take it? Nowadays you can get an adapter from anything to anything.

Just curious

Shawn

 

My oil pressure and water temp sensors threaded right in to the 3.3. My tach pickup came from a crank sensor so I just never bothered hooking it up. There was so much left over wiring on my sonoma that I decided to remove it. My biggest wiring change came with the fuel pump. The original electric pump wiring come directly from the ecm so I had to change it to a relay(just rewired one of the emmision control relays already in the panel. It would have been a lot of work to do away with the ecm in my truck because being newer(1999) all the signals going to the dashbord run through it so it was easier for me to leave it in.
Do any of you know if there is a double vbelt crank pulley available. I think it would be easier than trying to make my own.

 

I think cummins used a standard crank pulley that worked on their motors. I know a 4BT and 6BT can interchange pulleys, so I'm ASSuming you can use it on a 3.3 as well. You could make whatever spacer you needed to place it properly. I haven't found a 2 groove pulley but I did find this.

http://cgi.ebay.com/ebaymotors/CUMMI...spagenameZWD1V

It's off of a much bigger motor though, so I really can't say if it'd work. If you have a cummins dealer nearby maybe they'll let you walk through the warehouse.

 

Thanks for the feedback. I was referring to the temp sensor. I understand what you have done. Thanks. I may try to rethread or make a custom bushing.

I have picked up an oil pressure sensor, its just a single wire don’t know weather it is NC or NO to ground so I may need a relay. I probably will install it on a T fitting with a pressure gauge.

As for a fan I just looked on Summit the cfm range is generally from 755 to 3500. What cfm do you guys thing I will need given I an installing in a jeep and here is NC average summer heat is in the low to mid ninety’s. I spend very little time in traffic, mostly open road. Maybe I won’t need one!!!!? $$. If I try without I can get some dimensions and leave room when I install the radiator assembly.

Yes there is a double crank pulley I will get you a part # today. The 4b- 6b will not work 3.3 is a totally different design.

 

Well that's a good suggestion. Where were you two years ago?!?!

Like I said, I'm a novice at this and didn't even think to consider that option.

 

I don't recall the specs on the fan I used. Will try to find tonight or this weekend. I think having a fan is a good idea. The electric fan was really pretty easy to hook up. From what I've observed wouldn't think you need a large cfm one.

 

Look for pulley option # AF30007 Adapter Front Drive. Has three parts on this option
C0105031845 1 SCREW,HEX FLANGE HE
C6136311431 1 PLATE,CLAMPING
C6204331481 1 PULLEY,CRANKSHAFT

Call your dealer and see what the prices are I am curious…
I am pretty sure this is what you want.
Server is down at the moment If you want it I can verify.

TDI you say you are a novice I think your genius. I’m just a shade tree.

 

I'm blushing (although it might be from the bourbon).

Thanks for going to the effort to list the part numbers!

The document in my conversion folder for the electric fan says I'm using a Zirgo ZFSWA model.

Something like this:
http://cgi.ebay.com/ebaymotors/16-34...em130213073615

 

I checked through cummins parts this morning. 116 and change for the double pulley. Bolt and plate are same #s as existing parts. Thanks for the info I think I will try to order one.