Reluctor Ring / Wheel

jdwarns

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Location: Annapolis, MD
Boat: 2006 Tahoe 215 I/O
Engine: V6 Mercruiser 4.3l Alpha TKS
Engine Serial: 0W344165

Well I think I done screwed up. After buttoning everything up after a longblock rebuild, I found this piece amongst the parts returned to me by the machine shop that performed the rebuild:
ReluctorRing.jpg

It's quite obviously keyed to fit over my crankshaft and I'm assuming it's the reluctor ring as represented by part #23 here:
http://www.mercurypartsexpress.com/u...r4998bi5953664

My service manual makes absolutely no mention of the reluctor ring... even in the section detailing removal/installation of the crankshaft. It goes right from removal of the timing chain gear cover to removal of the camshaft and crankshaft sprockets. Clearly one would need to remove/install the reluctor ring with the special tool before removing/installing the crankshaft sprocket and yet there is no mention of it. That's why I missed it while bolting everything back together by the books using the service manual I ordered directly from MercuryMarine's website using my engine's serial number.

My initial thought was that maybe it's just part of a rebuild kit that the machine shop purchases for a 4.3l gm engine and that it's applicable to the truck engines but not the boat engines; and that they just threw it in the box along with the gasket kit and new oil pump (which was awesome of them to do). The problem is I know I have a camshaft position sensor that plugs into the timing cover and that the sensor would be pretty useless without the reluctor ring. I guess it's possible, although highly improbable, that the sensor is just a place holder and isn't actually utilized. Is this sensor used to measure my RPMs?

Before I rip the front apart again, I just want to make 100% sure that the reluctor ring is for my application and that I need to install it. I also don't feel like spending the big bucks on the tool to install it. Any suggestions on that?

Thanks in advance for your help
 
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Fun Times

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Re: Reluctor Ring

Re: Reluctor Ring

Boy you're having a rough time with this rebuild.:(

Hopefully Don will see this and be able to post the section of Page 3A-120 in service manual #32 90-864261 NOVEMBER 2001 again.:)

They show a clear photo of the reluctor ring coming out, So yes it needs to be there.
15. Remove engine front cover.
16. Remove the crankshaft position sensor reluctor ring.
 

jdwarns

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Re: Reluctor Ring

Re: Reluctor Ring

Boy you're having a rough time with this rebuild.:(
Not nearly as rough as it would be without you guys helping me. I really do appreciate it. And to think I've only posted about 10% of my rough times... things I couldn't figure out between the manual and other research :p.
It's well worth it in my opinion though. If I'm going to operate a piece of machinery, I prefer to know that machinery inside and out, and I've learned a ton about my engine over the last year.

Hopefully Don will see this and be able to post the section of Page 3A-120 in service manual #32 90-864261 NOVEMBER 2001 again.:)

They show a clear photo of the reluctor ring coming out, So yes it needs to be there.
15. Remove engine front cover.
16. Remove the crankshaft position sensor reluctor ring.
It's frustrating to pay $85 for a service manual fraught with discrepancies and omissions. Sure the manual pays for itself plus some the first time you use it, but come on let's fix these mistakes and no longer issue service manual #25 brand new to people; or at least include a supplement with it addressing all the errors.

Anyway, thanks again Fun Times for the response.
 

achris

More fish than mountain goat
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Re: Reluctor Ring

Re: Reluctor Ring

Unfortunately those plastic front covers are a one time use... When you pull it off, you gotta toss it in the trash... The good news is that they are available from a GM dealer for $39... I've had a look at the circuits and the TKS engine doesn't appear to use the CPS... The bad news is that without the reluctor in place the front pulley will be in the wrong pace.... So you have to have one in... I assume you pulled the CPS out and looked in the hole to make sure one wasn't there?

Chris......
 

jdwarns

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Re: Reluctor Ring

Re: Reluctor Ring

Unfortunately those plastic front covers are a one time use
Yep... and the one that's on there currently is brand new because the manual stated I couldn't reuse my old one.
I imagine it's because of the built in gasket along the lower portion getting beat up during removal and the oil seal that surrounds the crankshaft.


I assume you pulled the CPS out and looked in the hole to make sure one wasn't there?
I didn't have to. The longblock came back to me without a timing cover and I know for certain that there was nothing covering the crankshaft sprocket. I installed my new timing cover without installing the reluctor ring.

I had a few things working against me...
- I shipped the longblock down with the reluctor ring on, so it wasn't on my list of things to install when I got it back.
- The machine shop sent it back without the reluctor ring installed (I'm not upset about this and maybe there's even a good reason for it), but it was thrown in with all my other old parts they returned to me that aren't for reuse (pistons, rods, etc.).
- My service manual makes absolutely no mention of it.

Oh well... live and learn
 

achris

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Re: Reluctor Ring

Re: Reluctor Ring

....
- My service manual makes absolutely no mention of it.

Oh well... live and learn

Which one? seloc or clymer :facepalm:

Here's the real deal....
Engine -> https://docs.google.com/open?id=0B4XV6tt7Q0P-YjYwMTNjZDItODJkNi00NTAzLWE2Y2QtMDY0MGEzYjVlNjE1
Drive -> https://docs.google.com/viewer?a=v&...YWRiNy00ODUyLWFmNzgtMTBmMzhlNGY4Mzk3&hl=en_US

Download and save....

Have a look at page 150, section 3A... "Installation"....

Chris.....
 

Don S

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Re: Reluctor Ring

Re: Reluctor Ring

He has manual #25 Chris, which is what his carbed engine calls for. #32 is for the MPI engines, he is TKS.
Problem is, the 25 manual does not mention the reluctor.
 

Fun Times

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Re: Reluctor Ring

Re: Reluctor Ring

He has manual #25 Chris, which is what his carbed engine calls for. #32 is for the MPI engines, he is TKS.
Problem is, the 25 manual does not mention the reluctor.
Which now has me thinking he doesn't really need it due to he has a carburetor. No crank sensor to read? and maybe the reason why it's not in #25, interesting.:)

I love these forums, You learn so much.:)
 

Don S

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Re: Reluctor Ring

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Which now has me thinking he doesn't really need it due to he has a carburetor. No crank sensor to read? and maybe the reason why it's not in #25, interesting.:)

I love these forums, You learn so much.:)

He doesn't need it as far as being carbed, but it probably needs to be there to space the harmonic balancer to the proper distance as Chris mentioned earlier. Don't forget, that engine was automotive originally, and they didn't have carbs in 1998 and newer.
 

Fun Times

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Re: Reluctor Ring

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He doesn't need it as far as being carbed, but it probably needs to be there to space the harmonic balancer to the proper distance as Chris mentioned earlier. Don't forget, that engine was automotive originally, and they didn't have carbs in 1998 and newer.
Good point, And to keep everything in working order, It's better to have it in there.
 

achris

More fish than mountain goat
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Re: Reluctor Ring

Re: Reluctor Ring

He has manual #25 Chris, which is what his carbed engine calls for. #32 is for the MPI engines, he is TKS.
Problem is, the 25 manual does not mention the reluctor.

Probably because the TKS engine wiring doesn't use the CPS/reluctor. I think it still needs to be there for the correct spacing of the crank pulley... As a packer if you like, between the crankshaft timing gear and the balancer.

Chris........
 

Don S

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Re: Reluctor Ring

Re: Reluctor Ring

Probably because the TKS engine wiring doesn't use the CPS/reluctor. I think it still needs to be there for the correct spacing of the crank pulley... As a packer if you like, between the crankshaft timing gear and the balancer.

Chris........

Yeah, that's what I mentioned to FT about 2 minutes before you replied. ;)
 

achris

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Re: Reluctor Ring

Re: Reluctor Ring

Here's an idea for the OP... Take the reluctor and machine it down to the same O.D. as the balancer, then just pull the balancer off, slide the machined down reluctor on and push the balancer back on.... No need to remove the timing cover....

Chris....
 

achris

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Re: Reluctor Ring

Re: Reluctor Ring

Yeah, that's what I mentioned to FT about 2 minutes before you replied. ;)

Gimme a break!!! :D It takes that long for me to type.... ;)

Chris....
 

jdwarns

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Re: Reluctor Ring

Re: Reluctor Ring

Here's an idea for the OP... Take the reluctor and machine it down to the same O.D. as the balancer, then just pull the balancer off, slide the machined down reluctor on and push the balancer back on.... No need to remove the timing cover....
Now we're talking. I think everyone agrees that the CPS is not used in my application?
Just out of curiosity, anyone know where my RPMs are measured?
I can't think of anything wrong with your plan, Chris. The reluctor isn't responsible for creating any sort of seal with the sprocket or timing cover, so I think I'll go for it.

After measuring, it looks like I'll have the machine shop take it from a 4" O.D. to a 1.75" O.D. This will create a 1/4" ring between the I.D. and the O.D. (1/8" between the I.D. and O.D. where the notch is).

Any last rights on this before I go grinding?

Will I need to grease the timing cover opening again? If so, what kind of grease?

Thanks again everyone.
 

achris

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Re: Reluctor Ring

Re: Reluctor Ring

RPM's measured by pulses from the ignition system, not the CPS.

Any grease on the seal lip will do...
 

jdwarns

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Re: Reluctor Ring

Re: Reluctor Ring

RPM's measured by pulses from the ignition system, not the CPS.

Any grease on the seal lip will do...
Thanks again Chris. I'll update when I get it re-installed.
 

jdwarns

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Re: Reluctor Ring

Re: Reluctor Ring

Machine shop did a great job and milled it down to a 1.75" O.D. for me.
Slipped right in through the timing cover. Torsional damper installed again and torqued to spec.
Thanks again guys.
 
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