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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 10-09-2019, 10:36 PM   #11 (permalink)
56pan
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Quote:
Originally Posted by highdesertrange View Post
I was under the impression that all 6.2 and 6.5 use the same fluidampr. mine came with the spacer and the instructions said if you have the reluctor disregard the spacer and if you don't have the reluctor use the spacer. highdesertranger
That's the way I remember it when I put the Fluidampr on my '93, mech. injection.

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Old 10-10-2019, 10:09 AM   #12 (permalink)
jnlperformance
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they're the same. Both my 85 6.2 and 94 6.5 have them. Identical.

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Old 10-11-2019, 12:22 PM   #13 (permalink)
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The main difference between the two sets are in the roller chain sets.

You have two different types of chain sets. One WITH a reluctor ring, and one WITHOUT.

The reluctor ring is what the crank position sensor (cps) uses to count crank rotations.

The spacer in the 6.2 fluidampr set is used to compensate for the missing reluctor ring in the 6.2 roller chain set.

My advice; when working on a 6.x without the reluctor ring, when you service the timing set, use the 6.5 roller chain set (WITH reluctor ring). Install the CPS in the timing cover. Theres a press fit plug installed where the CPS goes.

This is the best way imo to gain a tachometer if you dont have one. Had I known that years ago when building my 6.2 I'd have done it like this to get a tach, and not the alternator.

So now whenever I build a 6.x I just use the reluctor ring sets and CPS for easy tachometer compatibility.

hope this helps
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Old 10-11-2019, 01:37 PM   #14 (permalink)
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Quote:
Originally Posted by jnlperformance View Post
The main difference between the two sets are in the roller chain sets.

You have two different types of chain sets. One WITH a reluctor ring, and one WITHOUT.

The reluctor ring is what the crank position sensor (cps) uses to count crank rotations.

The spacer in the 6.2 fluidampr set is used to compensate for the missing reluctor ring in the 6.2 roller chain set.

My advice; when working on a 6.x without the reluctor ring, when you service the timing set, use the 6.5 roller chain set (WITH reluctor ring). Install the CPS in the timing cover. Theres a press fit plug installed where the CPS goes.

This is the best way imo to gain a tachometer if you dont have one. Had I known that years ago when building my 6.2 I'd have done it like this to get a tach, and not the alternator.

So now whenever I build a 6.x I just use the reluctor ring sets and CPS for easy tachometer compatibility.

hope this helps
JNL, thanks for your post, EXCELLENT IDEA that is something that I've been thinking about. As I stated I am replacing the 93 with a Ted's pull which is a 2004 out of a Humvee. Fortunately, maybe (I've got to replace the front seal) the motor has that reluctor there, ie. there are some wires with a connector there, whereas my original motor does not have. I plan on bolting the original DB2 injector pump onto this motor and all the original accessories.

I want to do everything right the first time, because getting this monster in and out of the rear of the motorhome (pusher) has been an insane effort. I litterally have the back end jack way up so I could take it out from beneath. Well I'm getting off subject

You really got my attention about being able to put in a different Tachometer. I never realized how the tach was getting information. I never trusted the tach on this motor home as someone had mentioned they thought that the readings came from the alternator??? Am I thinking correctly that on a 93 tack comes from the oil pump?

I would love to put that reluctor ring to work for an additional tach. How would I go about that? Will that CPS wire up directly to a tach or does it require a power source as well. This is something I'd really like to do, and again thanks for suggesting that
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Old 10-11-2019, 01:56 PM   #15 (permalink)
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See post# 6.
Tach signal on a 93 comes from the alternator.
The ESS signal (oil pump drive) is just for the auto tranny.
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Old 10-11-2019, 08:46 PM   #16 (permalink)
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Quote:
Originally Posted by Glagulator View Post
See post# 6.
Tach signal on a 93 comes from the alternator.
The ESS signal (oil pump drive) is just for the auto tranny.
That is exactly right for a '93. And if your alternator goes bad, measure the pulley on the old one and compare it to the rebuilt/reman. one. Needs to be the same for the tach.
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'93 C2500 280,000 m.
60k on new AMG mil. surplus engine
Turbo with name that starts with A.
Straight pipe exh. (but it ain't that loud).
Peninsular intercooler
Boost, EGT, Glowshift intercooler in/out temp. 3 guage pod.
Rebuilt complete susp. with polyurethane bushings. (Bad idea).
20k on GM 4L80E rebuilt trans.
Dual thermostat/Duramax fan/high flow water pump.
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Old 10-12-2019, 10:13 AM   #17 (permalink)
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ArchiacAeronaut; they're right. The OEM signal comes from the alternator. But...

?? I thought you can get an easy tach from the cps?

So can you NOT??!

I did it the alternator way on the 85 to get a tach signal. It wasn't fun. Vdo diesel techs are expensive. It just makes sense to get it from the CPS as well...

I'm not talking about the OEM stock setup.... you should be able to add an aftermarket tach using the cps...

Anyway I haven't tried it yet personally but I dont see why it wouldn't work. at some point in time I'll end up giving it a shot on a mechanical...

Has anyone else tried it??
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Last edited by jnlperformance; 10-12-2019 at 10:29 AM.
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Old 10-12-2019, 11:06 AM   #18 (permalink)
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Quote:
Originally Posted by jnlperformance View Post
T

My advice; when working on a 6.x without the reluctor ring, when you service the timing set, use the 6.5 roller chain set (WITH reluctor ring). ps
Might want to change this advice as the two gears are keyed differently and affects timing. >https://www.dieselplace.com/forum/63...-sprocket.html

This may be the only place on the net where you can see the key timed differently.

Aren't you glad I brought that up?
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Old 10-12-2019, 11:15 AM   #19 (permalink)
jnlperformance
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Well then I stand corrected.

I may still try it on my 85 at some point. Just to see.

Thanks for that dp.

How about using a CPS as a quick tach signal? Curious. Ever tried it?
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Last edited by jnlperformance; 10-12-2019 at 11:16 AM.
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Old 10-13-2019, 01:45 PM   #20 (permalink)
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Okay, okay, I already changed out alternator on this rig. I read something about the alternator being the tach source after the change I don't even remember which pulley size I am using now. I have never trusted the tach since. I have heard changes in what I think is engine speed or transmission shifting with no change in tach! I wanted a higher output alternator for the motorhome batteries and I think the larger pulley was on it last.

OMG I HAVE LOST TRACK OF MY TACH and soon my mind

I want to use the cps out put on the new engine to privide a tach if able. What does an aftermarket tack need to operate? Sorry, kind of crazy today trying to help son out with timing belt kit and radiator fan problems on his vehicle and time constraints.

Hope you guys are having a better weekend

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