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Old 05-04-2016, 08:31 PM   #21
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I just pushem in while twisting in the appropriate direction. Soap is a must. Havent had a problem in years, everything from the little cummins impellors to the big double 16v92 impellors. I disable the start function and attatch my push button starter bump unit. Tap the impellor with a brass hammer while "bumping" the engine. I can change an impellor on my 8v92s in about 10 minutes. Practice helps.
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Old 05-04-2016, 09:08 PM   #22
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Dave: We greatly appreciate you sharing your frustration just the way you did. Many of us here don't have mechanical genius, ability or even inclination. Time, practice, and a lot more frustrating moments are in your boating future, but all the while you will be getting to know your boat, and who knows, maybe even become friends!
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Old 05-04-2016, 09:32 PM   #23
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Dave, I too thank you for your post, I had a similar impeller problem that a dock neighbor came over and bumped the starter on the engine while I taped it the rest of the way in.
Good luck!
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Old 05-04-2016, 09:43 PM   #24
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How does one disable the ignition so the engine doesn't start when bumping it?
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Old 05-04-2016, 09:53 PM   #25
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How does one disable the ignition so the engine doesn't start when bumping it?
You just bump it. Dont hold the start button long enough to start the engine.

Boatdiesel has a great 'how to' section for impeller installation for the 5.9. Worth the price of membership alone.
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Old 05-04-2016, 10:03 PM   #26
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How does one disable the ignition so the engine doesn't start when bumping it?
Good question. Especially since there really isn't an "ignition system" on a diesel.

Depending on the brand and model diesel you have to keep it from getting fuel. In many cases just leaving the start breaker or switch off will do that. On GBs I just use to hold the stop button in while rolling the engine over if I didn't have a remote start button with me.

Or you can use a wire tie or something else to hold a fuel solenoid in the no flow position.
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Old 05-04-2016, 10:07 PM   #27
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Good question. Especially since there really isn't an "ignition system" on a diesel.

Depending on the brand and model diesel you have to keep it from getting fuel. In many cases just leaving the start breaker or switch off will do that. On GBs I just use to hold the stop button in while rolling the engine over if I didn't have a remote start button with me.

Or you can use a wire tie or something else to hold a fuel solenoid in the no flow position.
I didnt bother with that. I just hit the starter for a split second. Just long enough to get power to the starter for a millisecond (i did not time it) and it didnt start.

In fact i did it several times without ant issues to get the old broken one out.
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Old 05-04-2016, 10:10 PM   #28
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I didnt bother with that. I just hit the starter for a split second. Just long enough to get power to the starter for a millisecond (i did not time it) and it didnt start.

In fact i did it several times without ant issues to get the old broken one out.
Depends on the diesel and depends on the day. I've gotten away with it plenty of times.

But I've also seen them fire off with not much more than a bump.
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Old 05-04-2016, 10:19 PM   #29
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Impeller

Dave: I have the QSB 5.9 380 in our AT-34 and have replaced the impeller a few times. On our engine I use silicon grease on the inside of the housing, then twist and push the impeller in until it lines up with the splines, then I use a long screw driver and it levers right in (end of screw driver lines up with a protrusion on the block and then pushs against the impeller with shank of driver). Your engine should be similar. Hope this helps.
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Old 05-04-2016, 11:00 PM   #30
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First time trying to change an impeller on a larger engine and I failed miserably.
Good that you're changing out. Ask me how I know.
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Old 05-04-2016, 11:05 PM   #31
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Depends on the diesel and depends on the day. I've gotten away with it plenty of times.



But I've also seen them fire off with not much more than a bump.

Thanks.

Mine fires off really quickly so that's why I was wondering.
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Old 05-04-2016, 11:24 PM   #32
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OK, just curious here....why is it necessary to bump the ignition to get the key at the top?
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Old 05-04-2016, 11:39 PM   #33
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Take a look at this: Impeller Installation Tool
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Old 05-05-2016, 07:40 AM   #34
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I just changed out the impeller in my Lehman last sunday. Wife timed me and said 15 minutes.
Old one came out with needle nose vise grips, Wife bumped the starter two times and it pulled out easily.
I did not use a compressor for installation I used the lube packet that came with the impeller (Johnson) and with a slight twist while squeezing the vanes and a push it slid right in.
You just need a little practice.
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Old 05-05-2016, 07:53 AM   #35
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I just changed out the impeller in my Lehman last sunday. Wife timed me and said 15 minutes.
Old one came out with needle nose vise grips, Wife bumped the starter two times and it pulled out easily.
I did not use a compressor for installation I used the lube packet that came with the impeller (Johnson) and with a slight twist while squeezing the vanes and a push it slid right in.
You just need a little practice.
That works great for small to medium sized impellers. But when you get to the big ones, it's a whole other story.
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Old 05-05-2016, 07:59 AM   #36
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That works great for small to medium sized impellers. But when you get to the big ones, it's a whole other story.

Yeah... I can't compress (enough), twist, and push ours at the same time. Especially on the pump I can't reach easily.

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Old 05-05-2016, 08:24 AM   #37
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Take a look at this: Impeller Installation Tool
Really cool looking/working tool... see the video. I contacted and asked where to purchase.
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Old 05-05-2016, 09:29 AM   #38
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How frustrating. Compress the vanes with a series of wire ties. Don't worry which way they compress they will fix themselves when the pump starts. Lube the impeller and shaft generously with grease of some sort; I use white lithium grease. As you push the impeller into the housing, cut each wire tie as it reaches the edge of the housing.

Hope this works for you. Good luck.

Respectfully Howard,

I would be very careful with type of grease as most grease(s) yes ! even vasoline will eat the rubber in the impeller. ( tried that n done it ) I find that dishwashing soap works great ! ....... FB
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Old 05-05-2016, 09:49 AM   #39
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. . . I cut the middle section out of an empty milk jug, making the section about 3" tall and the strip long enough to go all the way around the impeller and overlap an inch or two.


I wrap the section around the impellers then put the zip ties on the outside of the plastic strip. As I tighten the zip ties (I use 2 because of the height of the impeller) it forces the plastic strip to compress the vanes on the impeller. . . . .
Same idea. 1-gallon ice cream containers that look like Tupperware are also a good source of this slippery material.

Use pure silicone grease or wash-up liquid as a lube.
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Old 05-05-2016, 10:14 AM   #40
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Respectfully Howard,

I would be very careful with type of grease as most grease(s) yes ! even vasoline will eat the rubber in the impeller. ( tried that n done it ) I find that dishwashing soap works great ! ....... FB
Agree


KY is also "safe" if you happen to have some in your "tool box"

Lots of other uses aboard
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