Perkins 4-154 crank pulley alignment - SailNet Community
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post #1 of 27 Old 07-30-2008 Thread Starter
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Perkins 4-154 crank pulley alignment

I have an issue with my crank pulley...Its out of alignment with everything else by 3/8 to 1/2".

It is a duel pulley and appears to have the forward pulley bolted to the rear by 4 bolts and the rear has its own set of 4 bolts outside the forward pulleys circumference...wish i had a picture but dont.

My question :...
Is this some sort of split cone type pulley that once the froward pulley is removed and then also the next outer set of 4 bolts that the pulley can be loosened un-wedged (for lack of a better term ) from the crank shaft keyway and slid back my 3/8 to 1/2" to realign everything up again? There is room to slide it back about that far..

All the manules and exploded views I found on the net dont show this paticular pulley/vibration dampener. And the yard mechanic I had take a look did not know.
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post #2 of 27 Old 07-30-2008
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Hmm... wish you had a photo.

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Last edited by sailingdog; 08-04-2008 at 08:58 AM.
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post #3 of 27 Old 07-30-2008
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Is this something on a used boat you just bought? Or have you been running it that way for some time? Was the engine ever rebuilt, to your knowledge? The history of it might provide some insight as to why, or what's wrong.
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post #4 of 27 Old 07-30-2008
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Still- Pacific Power Products in Seattle is the Perkins distributor, maybe they can give you the name of a shop up in your area that works on Perkins ( ph. 800-962-7360). I know North Harbor Diesel in Anacortes seems to work on all engines, might give them a call, North Harbor Diesel. Not familiar with them myself so I can't help you.

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post #5 of 27 Old 08-03-2008
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If Pacific does not have info, try

Contact Trans Atlantic Diesels

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post #6 of 27 Old 08-04-2008
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There are pulleys around that use a tapered collar to fasten onto a shaft at any point chosen by the installer but I seriously doubt that anyone would have fitted one to an engine.

In the first instance, if the pulley is that far from the normal position it is unlikely that the oil seal journal will reach to the seal and you would be pumping engine oil out of the front of the engine.

In the second instance, the crank pulley normally serves the function of clamping the crankshaft timing sprocket in position. Without this function it would not be long before the sprocket eats away the key and causes a major calamity inside the timing cover

Niether of these functions would be served by the type of pulley described above. Those taper-clamp types are normally used on accessory shafts or electric motors. I've never seen one used on an engine.

Having said all that, I can't offer any advice on why the pulley would be that far out of position. Can you get the pulley assembly off? The solution may then be plain to see.

Andre
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post #7 of 27 Old 08-04-2008 Thread Starter
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Sorry Guys ...its been a hectic week and week end...I will take a picture when i get to the boat hopefully sometime this week..I can stick my finger behind the pulley so i know it can go back far enough to line up..

A little more info

1) I bought this boat Last summer.
2) Only sailed her twice...been on the hard for 10 months back in water now
3) I have to believe this misalignment was missed by the mechanical surveyor as I dont see how the 3 or 4 odd hours I've run the engine could have done it.
4) There dosent appear to be any oil leaking or a sealing surface on the back of the pulley/dampener that rides in the timing gear cover.
5 ) I havent tried to do anything with it yet...no time and wanted to ask you all about it first anyway.
6) Its not real noticeable so easy to miss..the only reason i found it was the belt was squalling so I noticed it in my tighten procedure.


I have spoken with Trans Atlantic and with out a picture they could not realy help other then tell me it wasent stock...So I will post a picture hopefully later this week....Its sort of a bear to get at due to the closeness of the gen set so didnt feel like just ripping it apart if it wouldn't do any good.

Jrd22 thanks for the tip...I will call them tomorrow

Last edited by Stillraining; 08-05-2008 at 12:10 AM.
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post #8 of 27 Old 08-05-2008
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You might just try tightening the center bolt.

It could just be working it self loose.

Rick
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post #9 of 27 Old 08-05-2008 Thread Starter
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Quote:
Originally Posted by timebandit View Post
You might just try tightening the center bolt.

It could just be working it self loose.

Rick
Rick ...There is no center bolt...the crank shaft penetrates through the pulleys by better then an inch.
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post #10 of 27 Old 08-05-2008
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I also have a Perkins engine it is a 4-108, and I noticed that the waterpump pulley was installed backwards. Now it lines up perfectly. Perhaps the same "MECHANIC" worked on both of our boats!
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