FORD 6600 Tachometer connection ON engine.

[UrbannGuerilla]

WHERE IS IT LOCATED? Is it the thing sticking out of the engine directly under the oil filter? It has 2 or 3 different sized holes in it, and it takes a hex head key (allen wrench) to screw/unscrew the plugs. My father thought that was where the oil pressure gauge hooked to, but there is already an existing oil pressure line- and it doesn't hook to that location. I'm trying to figure out if I need to purchase a "tachometer adapter"?

I included a picture of a tach adapter, and the location on the engine I was talking about. Circled in red is the area in question, yellow is oil press line.

I looked through the owners and repair manual, I didn't see anything about the location circled in red. (I could have missed it)

This post was edited by UrbannGuerilla on 09/02/2023 at 05:05 am.

 

[Jim.ME]

Welcome to the forums.

To post pictures look down the page a bit from the box where you type a reply, and you will see a bar that says ''Upload Phots/Videos''. Below that is a button that says ''Choose Files''. Click on that button to go to your device where you can search your files to find the picture you want post, select your picture, then click the ''Open'' button and the program will upload that picture to your post. There is a size limit of about 7 MB of pictures/video per post (not per thread). That can be one picture or the total of several pictures in a post. This is the same in Modern and Classic views.

The tach drive adapter mounts right below the oil filter.

 

[UrbannGuerilla]

Thanks for the reply Jim. I did that (I thought). Edited to include original pictures. Looks like I might have to re-run the oil pressure line to a different route.

This post was edited by UrbannGuerilla on 09/02/2023 at 05:51 am.

 

[Destroked 450]

If your tractor is a 6600 it s had an engine change, that engine is for a early model 5000 that will not except a tach drive adapter from a later model
Those engines had tach drives on the back of the generator

Can you post a photo of the complete tractor ago with the model codes

 

[sotxbill]

Since... you appear to have an early engine, you can buy an alternator replacement that will have a tach drive that will work.. But that usually required you change the instrument panel out to the early panel that the tach needle operated in the opposite direction as on the early model 5000 did. https://www.amazon.com/Alternator-Conversion-Ford-Tractor-2000/dp/B082Q2MR8H https://www.amazon.com/Instrument-Gauge-Cluster-fits-81816896/dp/B01FL5BAW0


I believe both of these are also available from this site as well.

Or you could change the engine back for a slightly higher cost?????

 

[Sean in PA]

Neither the 6600 nor the earlier 5000 had an actual oil pressure gauge originally. They had a warning light that was controlled by a pressure switch that was located where the elbow is in your picture, so I assume that the oil pressure gauge is not part of the original instrument cluster.

 

[UrbannGuerilla]

(quoted from post at 06:07:19 09/02/23)
If your tractor is a 6600 it s had an engine change, that engine is for a early model 5000 that will not except a tach drive adapter from a later model
Those engines had tach drives on the back of the generator

Can you post a photo of the complete tractor ago with the model codes

I can post a photo of the complete tractor. The model codes are more of a task.. the tag is gone under the hood above the battery. I see the spot where it used to be. I would have to take a wire brush or something to the front right of the transmission to reveal those numbers because at some point many years ago it was painted. I'll take some pics tomorrow when its light out. I know there is a number on the side of the engine itself, and also some strange looking numbers at the bottom right side of the engine just above where the oil pan is on the "passengers side".

This post was edited by UrbannGuerilla on 09/03/2023 at 07:54 am.

 

[UrbannGuerilla]

(quoted from post at 10:02:04 09/02/23) Since... you appear to have an early engine, you can buy an alternator replacement that will have a tach drive that will work.. But that usually required you change the instrument panel out to the early panel that the tach needle operated in the opposite direction as on the early model 5000 did. https://www.amazon.com/Alternator-Conversion-Ford-Tractor-2000/dp/B082Q2MR8H https://www.amazon.com/Instrument-Gauge-Cluster-fits-81816896/dp/B01FL5BAW0


I believe both of these are also available from this site as well.

Or you could change the engine back for a slightly higher cost?????

I believe this 6600 is 77-79, but I'm not positive. If I recall correctly on one side of the engine it has a number that starts with C5, I tried to look up information on that number weeks ago and that was what I concluded based on that number. I could be wrong. I think we will pass on the engine change route :lol:

 

[UrbannGuerilla]

(quoted from post at 10:26:35 09/02/23) Neither the 6600 nor the earlier 5000 had an actual oil pressure gauge originally. They had a warning light that was controlled by a pressure switch that was located where the elbow is in your picture, so I assume that the oil pressure gauge is not part of the original instrument cluster.

No the oil pressure gauge was installed by a previous owner. Its an aftermarket gauge. It goes from 0-80 psi and when the tractor is running the gauge reads 80 psi. Does that sound correct? Its mounted near the left side of the gear shift base plate.

 

[Sean in PA]

If I recall correctly on one side of the engine it has a number that starts with C5

That is the casting code, and C5 means that the casting was designed in 1965, which was the beginning of the 3 cylinder 2000, 3000 and 4000 series, as well as the 4 cylinder 5000 series. The 6600 wasn't made until the 1975 model year, so I would expect the casting code on an engine from a 6600 would start with the letter D.

 

[Destroked 450]

My 6600 is a December 75 build, engine casting numbers are D4NN

 

[UrbannGuerilla]

(quoted from post at 06:07:19 09/02/23)
If your tractor is a 6600 it s had an engine change, that engine is for a early model 5000 that will not except a tach drive adapter from a later model
Those engines had tach drives on the back of the generator

Can you post a photo of the complete tractor ago with the model codes

I don't know how many of these I can post into one post, but I will make several if I have to.
number right above oil pan on right side bottom of the engine

This post was edited by UrbannGuerilla on 09/03/2023 at 09:56 am.

 

[UrbannGuerilla]

(quoted from post at 06:07:19 09/02/23)
If your tractor is a 6600 it s had an engine change, that engine is for a early model 5000 that will not except a tach drive adapter from a later model
Those engines had tach drives on the back of the generator

Can you post a photo of the complete tractor ago with the model codes

One more set .. I've tried to add the other 4 photos twice now.. so I'm just gonna wait a few minutes and see whats going on. The other set includes the numbers on the transmission which starts with D.

This post was edited by UrbannGuerilla on 09/03/2023 at 09:55 am.

 

[Sean in PA]

The R at the beginning of the engine serial number along with the C5NE casting code for the block definitely says that it is an engine from an early 5000 series tractor. That R changed to an E on 4/1/1968.

The D4NN casting codes on the transmission say that the trans casting was designed in 1974, which would be correct for an early 6600.

So it looks like a 6600 that had the engine replaced with an early 5000 series engine at some point.

 

[UrbannGuerilla]

(quoted from post at 11:13:09 09/03/23) The R at the beginning of the engine serial number along with the C5NE casting code for the block definitely says that it is an engine from an early 5000 series tractor. That R changed to an E on 4/1/1968.

The D4NN casting codes on the transmission say that the trans casting was designed in 1974, which would be correct for an early 6600.

So it looks like a 6600 that had the engine replaced with an early 5000 series engine at some point.

That's disappointing. We thought we were getting a more capable tractor than we already have in our AC5050.. turns out we unknowingly got the same tractor in a different color but with a wider track width. I just ordered some items for the tach and tach adapter and gauge cluster from YT on Friday, and now I'm not sure I even can use them. lol

This post was edited by UrbannGuerilla on 09/03/2023 at 12:22 pm.

 

[Destroked 450]

You ve got a good bit more tractor than the AC5050, it s just not as much as you though you were getting
With the early 233 engine your 6600 is basically the same as the 5600 model
AC5050 has 168 ci engine making 50 pto hp, it has a 6.4 gpm hydraulic pump and weighs around 4500 lbs without ballast
Ford 5600 has 233 ci engine making 60 pto hp, it has a 9.7 gpm hydraulic pump and weighs around 6000 lbs
Ford 6600 has 256 ci engine making 66 pto hp, hydraulic pump and weight are the same as the 5600
There are a number of options to get a working tach, unfortunately the factory setup is not one as the early blocks will not except the tach drive adapter
A machine shop may be able to make a screw in adapter but I have never researched it
A conversion alternator is popular but it requires some modification to the wiring harness along with the reverse rotation tach of the older models. My experience with this setup has the tach reading 200-400 rpm fast at pto speed
A full change over to the 5000 generator, regulator, wiring harness and dash is another but not worth the cost to me
Checking to see if that Simms injection pump can be equipped with a 7000 tach drive would be a good option if possible

 

[UrbannGuerilla]

(quoted from post at 15:38:14 09/03/23)
You ve got a good bit more tractor than the AC5050, it s just not as much as you though you were getting
With the early 233 engine your 6600 is basically the same as the 5600 model
AC5050 has 168 ci engine making 50 pto hp, it has a 6.4 gpm hydraulic pump and weighs around 4500 lbs without ballast
Ford 5600 has 233 ci engine making 60 pto hp, it has a 9.7 gpm hydraulic pump and weighs around 6000 lbs
Ford 6600 has 256 ci engine making 66 pto hp, hydraulic pump and weight are the same as the 5600
There are a number of options to get a working tach, unfortunately the factory setup is not one as the early blocks will not except the tach drive adapter
A machine shop may be able to make a screw in adapter but I have never researched it
A conversion alternator is popular but it requires some modification to the wiring harness along with the reverse rotation tach of the older models. My experience with this setup has the tach reading 200-400 rpm fast at pto speed
A full change over to the 5000 generator, regulator, wiring harness and dash is another but not worth the cost to me
Checking to see if that Simms injection pump can be equipped with a 7000 tach drive would be a good option if possible

Thanks for your input. I think at this point the conversion alternator seems like the easiest path to take. Definitely not going the generator route, that really seems like a hassle, and probably more expensive than it needs to be. A tach on the injector pump is really foreign to me, I've never even heard of that. Hoping a conversion alt will work.

EDIT/ADD: What tractor did you put a conversion alt on previously, and how did you know it was reading 200-400rpm high at PTO speed if it didn't have a tach on it before? (This isn't a gotcha question, I'm genuinely curious)

This post was edited by UrbannGuerilla on 09/05/2023 at 12:23 pm.

 

[Destroked 450]

I converted probably 1/2 dozen 3/4/5000 models
After my second conversion that was on my 4000 the engine didn t sound right with the tach at 1800 rpm for pto operation
I used a digital tach on the pto and kept increasing engine rpm until the pto was at its correct 540 rpm, at that point the tach was showing 2100
When we converted the 5000 we used the same process to find 540 pto speed, on that one the tach was showing 2200 rpm
I really don t care what idle or max rpm is, I just need a reference mark to get pto speed, and where to tell another operator to set the rpm s at

 

[UrbannGuerilla]

(quoted from post at 15:52:44 09/05/23)
I converted probably 1/2 dozen 3/4/5000 models
After my second conversion that was on my 4000 the engine didn t sound right with the tach at 1800 rpm for pto operation
I used a digital tach on the pto and kept increasing engine rpm until the pto was at its correct 540 rpm, at that point the tach was showing 2100
When we converted the 5000 we used the same process to find 540 pto speed, on that one the tach was showing 2200 rpm
I really don t care what idle or max rpm is, I just need a reference mark to get pto speed, and where to tell another operator to set the rpm s at

Thats pretty cool. I was wondering what the RPM's would change to for PTO540 considering the different engine (maybe not much). I'm gonna check that gadget out.

 

[Sean in PA]

(quoted from post at 16:44:05 09/06/23)
Thats pretty cool. I was wondering what the RPM's would change to for PTO540 considering the different engine (maybe not much). I'm gonna check that gadget out.

The engine rpms will be the same. It is the gearing of the PTO drive chain through the transmission and out the rear of the tractor that dictates what the engine rpms need to be at to achieve 540 rpm PTO speed. Doesn't matter what engine you put in front of the transmission, the engine rpms will need to be the same.