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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 08-09-2014
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Tips on loosening screw

I need to remove the cover on the hand crack shaft on our Yanmar 3gm30f.

The 2 screws on the cover are impossible to loosen (re the photo in which the upper screw in displayed)

Any tips on how the loosen them ?
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Old 08-09-2014
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Re: Tips on loosening screw

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Originally Posted by carlager View Post
I need to remove the cover on the hand crack shaft on our Yanmar 3gm30f.

The 2 screws on the cover are impossible to loosen (re the photo in which the upper screw in displayed)

Any tips on how the loosen them ?
Unfortunately, the paint on many engines makes a penetrating oil solution for bound up screws/bolts ineffective. What I have found to work is a hand held impact driver that, usually, will not "bugger" up the screw head. For me, one blow with the twist in the tighten direction (clockwise) and a second in the loosen direction (counter-clockwise) has often done the trick.

FWIW...
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Old 08-09-2014
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Re: Tips on loosening screw

YES! Take a correctly sized, good quality screwdriver. place it on the screw and wack with a hammer several times, very hard. then remove the screw.

Make sure your using a #2 Philips on a #2 screw, and not a #3 screw.
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Last edited by UnionPacific; 08-09-2014 at 11:20 AM.
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Old 08-09-2014
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Re: Tips on loosening screw

Same comments... make SURE you're using a screwdriver that fits the screw perfectly.. no wiggle room. If not, you'll end up stripping the already questionable grip that phillips head screws afford you. If you DO ruin the grooves in the screwhead, you can carefully cut a single long slot it in for a larger flat-head screwdriver, but be careful you don't cut too deep.

The tighten first then loosen trick can work... not a bad tip to break loose a stuck screw, provided it hasn't been over-torqued in the first place.

Breaking a screw or bolt loose required the OPPOSITE tactic of properly tightening it in the first place. When tightening or torquing, always apply increasingly steady pressure until you're at your desired tigthness... no yanking. When you're trying to free a bolt or screw, however, seat your driver as firmly has humanly possible... PUSH the sucker in with your entire body and weight (and then some if you can get extra purchase behind you) then really crank on it hard.. go for it. Try your best to imitate an impact driver.. impact!

Or, as one of the first responders said above, get an impact driver. DeWalt makes a battery-powered one that's saved my butt on rusty screws that would NEVER have come out any other way on my cars. Great tool, very small, and a surprising amount of power.

Good luck!

Barry
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Old 08-09-2014
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Re: Tips on loosening screw

Its nice you've got replies from professionals who know what they are talking about... Now you get mine

I find swearing a lot often helps.

Next... Call the Yanmar mechanic because $90 may save a bucket load of drilling it out and all. This is serious advice from someone who isnt very good with a screw driver, or doesnt have the right tools.

The other bit is why are you removing it? Is there no other way to do the job? Is the job necessary? Like the other thread a few days ago where the forum wanted a guy to do a full rebuild on an engine with no problems. Do you really need to do it?

Good luck.

Mark
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Re: Tips on loosening screw

You really need an impact driver for the already damaged screw. Almost all other approaches will just further damage the screw head. I can't imagine that on an installed engine in a sailboat that you can get I to a position to apply enough force into a screwdriver to loosen the screw without further damage to the head. If the head is damaged to the point it becomes useless I have found a better approach to the filing a slot for a flat blade is to use a dremel tool to create wrench flats for an open end wrench. Either way you risk sheering the head of the screw. Then you are on to a whole new level of work.
Good luck,
John
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Tips on loosening screw

Thanx a lot for all advice.

Will it be easier loosening the screw when the motor is warm ?
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Re: Tips on loosening screw

Impact and torque should do it. Get some friends and a case of beer. One holds the large square shanked Phillips .One puts a twist on the wrench or visegrips and you smack the driver handle with a hammer. A bit of forth and back in the torque department will help. Swearing in unison sometimes helps. If not, you've still got the beers so the day is good.
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Re: Tips on loosening screw

I just got the Dewalt cordless impact driver with 300lb/ft. It's brilliant for stuck screws, and changing wheels on the car.

I used it the other week to change the starter motor on the boat. I couldn't get enough purchase on the bolts from the side, so I wound up with the impact driver, and 5ft of extension, from the cabin. It worked like a treat.

You could also try one of these :

Ratchets, Sockets & Wrenches | Nut Drivers | Impact Driver, 3/8" Drive | B640736 - GlobalIndustrial.com

Every toolbox should have one. You hit the end with a lump hammer and it converts the impact into a twisting motion. Works great for stuck screws and it's cheap.
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Last edited by MarkSF; 08-09-2014 at 01:07 PM.
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Re: Tips on loosening screw

Quote:
Originally Posted by Capt Len View Post
Impact and torque should do it. Get some friends and a case of beer. One holds the large square shanked Phillips .One puts a twist on the wrench or visegrips and you smack the driver handle with a hammer. A bit of forth and back in the torque department will help. Swearing in unison sometimes helps. If not, you've still got the beers so the day is good.
or you could just buy a simple, inexpensive tool designed for the job.
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