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Old 14 August 2012, 15:56   #1
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Seized Thrust Washer - Help!

After much procrastination (I was busy, the weather was crap, etc.) I knuckled down and serviced the Tohatsu 9.8hp 2 stroke. Successfully it would appear, but I need a bit of advice/help.

Basically, the thrust washer behind the prop is seized in position on the prop shaft. It's a light little engine so I haven't exactly gone at it with hammers yet, pending advice. Any pointers for freeing it and removing it? I don't have much in the way of fancy bench kit and I'm a mechanical novice. Generic pic of hardware below.

While we're down there () I found that the castle nut on the prop was loose. On refitting it appears that to actually "tighten" it leaves it covering the hole for the pin so probably unwise to force it any further. I left it loose in the event. Is this accepted practice?

Thanks in advance.
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Old 14 August 2012, 16:22   #2
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Try using a brass drift and hammer. Gently...
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Old 14 August 2012, 16:34   #3
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Re' the castellated nut you need to add a thin shim or washer(s) so you can torque it correctly but still have the hole in the right spot.
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Old 14 August 2012, 16:42   #4
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The hammer approach is likely to break the shaft seal. The best solution for the washer is a gear puller. Over here you can get cheap ones at places like "tool town" and "harbor freight".
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Old 14 August 2012, 16:47   #5
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Quote:
Originally Posted by captnjack View Post
The hammer approach is likely to break the shaft seal. The best solution for the washer is a gear puller. Over here you can get cheap ones at places like "tool town" and "harbor freight".
Ah-ha! That's what I need. Bet I can borrow one too

Max... of course!
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Old 14 August 2012, 16:55   #6
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get a blow lamp or the missus' curling iron & get a bit of heat into the washer. Start around the outer edge of the washer so the heat works inwards towards the shaft. Put the nut on the shaft & give it a tap with a soft mallet or a hammer with a wog between it. You might even get away with a couple of kettles o' boiling water if you're lucky. It doesn't take much.

PS (wog = wump of wood)
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Old 14 August 2012, 17:02   #7
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Pikey - perhaps one to try again, trouble is, the damn thing is so small that the flame was heating everything! I had applied a bit of heat and tapped it via bit of hardwood, but hadn't fully explored the technique. I'll try a bit of heat shield (wet rag?) on the cool bits and retry.

I have a bit of diesel soaking into it at the mo, maybe that will ignite and enliven the proceedings a touch!


Thnx
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Old 14 August 2012, 17:08   #8
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Go to Machine mart they do a small puller for about 6,i use one for removing siezed wiper arms so they are strong but easy to use
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Old 14 August 2012, 17:08   #9
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Originally Posted by willk View Post
Pikey - perhaps one to try again, trouble is, the damn thing is so small that the flame was heating everything! I had applied a bit of heat and tapped it via bit of hardwood, but hadn't fully explored the technique. I'll try a bit of heat shield (wet rag?) on the cool bits and retry.

I have a bit of diesel soaking into it at the mo, maybe that will ignite and enliven the proceedings a touch!


Thnx
You could try dunking the whole bottom end in a bucket of iced salty water until it chills & then applying the heat to the washer. A touch of thermal shock sometimes does the trick, plus it gives you a head start on the heat before it gets into the shaft.
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Old 14 August 2012, 17:21   #10
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Why do you need to take off the thrust washer?

It's stuck on my engine too - but I'm leaving well alone (unless of course you've got a leaking oil seal).

I would just regrease the splined shaft, pop the prop back on, washer and castellated nut (+ new split pin).
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