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post #1 of 13 Old 06-17-2011 Thread Starter
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Stripped Transmission Dipstick

I dont know how I managed to do it, but when topping off fluids I managed to strip off the thumbscrew for my Yanmar KM2P-1 transmission. I have a new dipstick, but I have no idea how I'm going to solve this. How do I get the threaded thumb screw out??!

What it should look like (new replacement diptstick)


What it looks like now


What my transmission housing looks like....BIG


(*UGH*)


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post #2 of 13 Old 06-17-2011
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There are a number of ways to get that out, most of them easy depending on how tight the fitting is.

My first shot would be a square steel rod with the diagonal dimension slightly bigger than the hole in the plastic and sharp corners, tap it in, turn it out.

A second way would be a strong pair of flat tipped circlip pliers that you can put in, squeeze and turn.

As a last resort, stuff a clean piece of lint-free cloth down through the plug (keeping the outer end where you can still get to it) and then collapse the plug inward into the cloth with a hammer and screwdriver/chisel, removing the pieces as you go.


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post #3 of 13 Old 06-17-2011
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Amazon.com: 8 piece Easy Out Screw Bolt Extractor Set: Home Improvement

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post #4 of 13 Old 06-17-2011
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Allan wrench: tap, tap, tap, turn, turn, turn

Small slow movements until you're certain it's free.
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post #5 of 13 Old 06-17-2011
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One needs to be careful using screw extractors in plastic because the plastic expands at a similar rate to the taper on the screw extractor so if there is any tightness in the piece you're trying to remove, it becomes a self-fulfilling problem.

Screw extractor gets tight, plastic expands, plastic gets tighter, screw extractor gets tighter, plastic expands more, plastic gets tighter . . . . . .

Then again, it may come straight out.

I believe a parallel sided tool will work better but that's just me.


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post #6 of 13 Old 06-17-2011
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I think the broken piece will come out easily with one of the methods described. The bigger question to me is why it broke in the first place. Did the transmission fluid (or heat) weaken the plastic? If so it seems like a problem that is just waiting to happen again.
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post #7 of 13 Old 06-17-2011
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I wish my engine was that clean!!

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post #8 of 13 Old 06-17-2011
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You might want to try heating up the metal housing a little with a heat gun in low setting before trying to extract. A wild guess is that the dipstick was tightened while the tranny box was hot and it broke while trying to unscrew when the tranny was cold?

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post #9 of 13 Old 06-17-2011 Thread Starter
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Quote:
Originally Posted by turbulicity View Post
You might want to try heating up the metal housing a little with a heat gun in low setting before trying to extract. A wild guess is that the dipstick was tightened while the tranny box was hot and it broke while trying to unscrew when the tranny was cold?
This could be...I often do a cursory check of the fluids after I come back to the dock.

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post #10 of 13 Old 06-18-2011
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This may be like after the horse left the barn, but there's really little reason to check the transmission fluid unless you find you have a leak. Your engine is so clean, that a small white absorbent pad underneath will tell you more than checking the level and having the same issues with your new dipstick.

I check my oil level before I start the engine and check underneath. My transmission fluid gets changed every year, but I don't check the level in between fluid changes. Been doing that for 13 years, no problems yet.

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