Flywheel lock - Chevy and GMC Duramax Diesel Forum
06-07 LBZ & LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

 
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post #1 of 8 (permalink) Old 01-26-2020, 03:08 PM Thread Starter
 
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Flywheel lock

I'm changing the water pump on my 2006 Jayco Seneca Zx that sits on the Chevrolet Kodiak c5500 chassis and is powered by the Duramax 6.6 lly.

I'm trying to get the fan clutch off with the large nut, but I'm having trouble getting the flywheel to lock, so I can get the nut off . There's no place in or behind the pulley to fit anything into, so I took the starter out and thought I could jam something in there. Unfortunately the flywheel isn't turning when I turn the big nut, so of course it isn't coming loose. Any suggestions?
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post #2 of 8 (permalink) Old 01-26-2020, 03:15 PM
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You might have to find one these. They go in an inspection hole in the bellhouse.
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post #3 of 8 (permalink) Old 01-26-2020, 03:41 PM
 
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I always just used a big wrench and a hammer.Otherwise you will have to find a way to hold the pulley.The flywheel lock won't help because the pulley will slip on the serpentine belt.Merchant auto also makes a tool that can be used with an air hammer that seems like it would work well

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post #4 of 8 (permalink) Old 01-26-2020, 03:47 PM Thread Starter
 
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Originally Posted by bimmer95 View Post
I always just used a big wrench and a hammer.Otherwise you will have to find a way to hold the pulley.The flywheel lock won't help because the pulley will slip on the serpentine belt.Merchant auto also makes a tool that can be used with an air hammer that seems like it would work well

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I do have a big wrench and a hammer, where do I hammer?
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post #5 of 8 (permalink) Old 01-26-2020, 05:13 PM
 
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Put the wrench on the nut straight up or slightly leaning towards the passenger side of the truck and hit the end of the wrench in the direction the nut needs to turn(toward the passenger side to loosen)..4 pound hammer is what I use..generally a couple good blows will knock the fan loose so u can spin it off by hand

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post #6 of 8 (permalink) Old 01-26-2020, 11:21 PM
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Personally, I had no luck with the various whack-it approaches. If you have the time, search for a spanner wrench that claims to fit in the holes in the pulley (I think there are 3 holes, so the spanner would fit in 2 of them). I didn't want to wait, so I made one with a large steel carpenter square and a couple of bolts that fit in the pulley holes. That way you (or better, your assistant) can hold the pulley while you whack on the nut.

You will also need the Lisle tools in Post #2 to hold the flywheel when you take off (and later put back on) the harmonic balancer on the crank. Yes, you have to take it off to get at the hidden bolt on the water pump. Actually, I didn't use the flywheel lock to take off the crank bolt because my mighty HF air impact wrench took it right off. Others use a really big breaker bar with a pipe extension (and would have to use the flywheel lock).

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post #7 of 8 (permalink) Old 01-27-2020, 08:27 AM
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Quote:
Originally Posted by Roger Harris View Post
I'm changing the water pump on my 2006 Jayco Seneca Zx that sits on the Chevrolet Kodiak c5500 chassis and is powered by the Duramax 6.6 lly.

I'm trying to get the fan clutch off with the large nut, but I'm having trouble getting the flywheel to lock, so I can get the nut off . There's no place in or behind the pulley to fit anything into, so I took the starter out and thought I could jam something in there. Unfortunately the flywheel isn't turning when I turn the big nut, so of course it isn't coming loose. Any suggestions?
Get the Lisle lock set that's shown on another post. I have one if you can't find it anywhere. You should mention where your'e located, somebody might have one in your area.......

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post #8 of 8 (permalink) Old 01-27-2020, 08:53 AM
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Something that hasn't been pointed out yet, but the fan you're trying to pull is not part of the water pump as with most other engines. So the flywheel lock has no effect on keeping it from spinning.

Short quick blows on the wrench with a shop hammer will break the fan nut loose.
It's not that tight. The rotation of the engine holds it in place.

The flywheel lock is for when you remove the lower balancer pulley, to access 1 of the water pump bolts that's behind it.

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