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Old 31-12-2020, 00:31   #1
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frozen 4 108 Perkins

At a loss as to what the procedure is for a crank that will not budge
I am concerned that if I try with a bigger breaker bar something will get damaged . The gearbox, pump and alternator all turn freely
has anyone been through this before ?
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Old 31-12-2020, 04:05   #2
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Re: frozen 4 108 Perkins

Did you remove the fuel injector is there a possibility of water in the cylinder?
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Old 31-12-2020, 05:42   #3
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Re: frozen 4 108 Perkins

Welcome to the forum, Lost.

As said, water in the cylinder(s) is the first thought. If you pull the injectors and don't find that water is the problem, add some penetrant oil to each cylinder, let sit, and try again. Realize that you will have to change the crankcase oil. Check it early in the game for water as well. If the cylinders are empty, penetrant has been added, and it's still frozen, that's a rare case, and likely was sitting so long that it's essentially one block of metal.
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Old 31-12-2020, 08:49   #4
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Re: frozen 4 108 Perkins

Quote:
Originally Posted by tkeithlu View Post
If you pull the injectors and don't find that water is the problem, add some penetrant oil to each cylinder, let sit, and try again.
PB Blaster is the go-to brand for this step.

Good luck!
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Old 31-12-2020, 09:07   #5
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Re: frozen 4 108 Perkins

A little more information would help to diagnose the problem.

Is this an engine that was running and now is frozen? Have you ever seen this engine running? Was it sitting and for how long?
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Old 31-12-2020, 11:41   #6
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Re: frozen 4 108 Perkins

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Originally Posted by tkeithlu View Post

likely was sitting so long that it's essentially one block of metal.
If it got salt water in the cylinders that wouldn't take long.
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Old 31-12-2020, 11:59   #7
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Re: frozen 4 108 Perkins

Perkins are notorious for hydrolocking which is what happens when water gets into a cylinder. Checking your oil, is the color normal or is it milky white? That is a sure sign of water.

As said above, pull the injectors which is easy, and then put a socket on a breaker bar and see if you can manually rotate the engine in either direction and if so, can you now turn it over 1 complete revolution? If you can't get it to budge or only a very little then suck out and water sitting in the cylinders and start flooding the tops of the cylinders every day and see if the level goes down. Try and turn the engine with the breaker bar. I did this for a couple of weeks before I finally got some movement. After that it wasn't too long before I could fully rotate the engine. Change the oil and filter, put it back together and fire it up. Run it for a bit then change the oil and filter again.
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Old 31-12-2020, 16:41   #8
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Re: frozen 4 108 Perkins

Try using a 50/50 mix of ATF and acetone. The ATF seeps everywhere and the acetone turns the rust into a brittle substance. Soak it everyday. You would be amazed how well the stuff works. Cheaper as well.
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Old 02-01-2021, 11:23   #9
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Re: frozen 4 108 Perkins

I would agree with others on possibility of water intrusion on the cylinder closest to the exhaust elbow. Remove that injector. If you find water in that cylinder, remove all the injectors. If the engine turns over (by hand) drain the oil and see if any water made it's way to the crank area. If all goes well, reassemble, start, let it come up to temperature and change the oil and filters again.
Do not use force with a breaker bar.
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Old 28-02-2021, 17:13   #10
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Re: frozen 4 108 Perkins

We hydrolocked our 4108 earlier last season, injector removal is a super tough procedure especially with the bowman heat exchanger. Ultimately I decided I didn't have the right tool for the job (injector puller) and had the local mechanic check it out. We're still not clear as to the root cause but a tear-down and checkout of the exhaust elbow is prescribed. Removing injectors, turning it over, fogging oil down the injector ports, re-install, turn over again, change oil 2 or 3 times. Oil analysis still shows elevated silica and salts, so that might not even have been enough. As has been said, don't force anything. If you blow your starting fuse, jumping it will only lead to blowing out a starter or breaking engine internals. Ask me how I know
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Old 28-02-2021, 19:18   #11
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Re: frozen 4 108 Perkins

so after several weeks of spraying diesel oil into the injector ports after removing them by slipping a nylon line under the loosened collar then putting constant upward tension on the line, I have managed to finally free the crank !! what a relief .
now I will start cleaning it out changing oil etc.
thank you to all for the great advice
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