Oil drain plug crush washer thickness question - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 28 (permalink) Old 11-02-2019, 05:04 PM Thread Starter
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Oil drain plug crush washer thickness question

Hi there,

I bought a replacement crush washer for my oil change, dimensions per this thread: https://www.triumphrat.net/air-coole...ml#post1500984


However, when I removed the drain plug, I noticed that the crush washer that came out was 3mm in thickness, instead of 2mm. Since this was the first oil change and the washer looked to be in good condition I just re-used it, but for next time, does a 1mm difference in thickness matter? I imagine that using a thinner washer will just mean the plug is screwed in a wee bit more but I want to make sure.

Thanks!
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post #2 of 28 (permalink) Old 11-02-2019, 05:15 PM
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After 4 years and 40,000 km I am still using the original washer. No need to replace it. The correct torque is important however.
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Last edited by StreetTwin; 11-02-2019 at 05:46 PM.
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post #3 of 28 (permalink) Old 11-02-2019, 05:59 PM
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I'm not a fan of reusing crush washers. I know many do, but it's such a cheap part. I bought a bag of them from an on-line hardware retailer

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post #4 of 28 (permalink) Old 11-02-2019, 07:28 PM
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Crush washers are soft so they seal better, being a tight arse and not replacing is not a good idea, my Triumph dealer always throw in a new washer when I buy my filters, but in my younger days I would use the old drain plug washers over and over and only replace when they no longer seal and if I had to pay for a new washer what's $1 at the most, you motor is worth a lot more and for the OP 2mm or 3mm as long as it seals won't make much differents at all.

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post #5 of 28 (permalink) Old 11-03-2019, 08:26 AM
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In fifty years of motorcycling I have yet to replace a drain plug washer. It's not about being frugal, it's about not replacing parts needlessly.
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post #6 of 28 (permalink) Old 11-03-2019, 10:59 AM
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Quote:
Originally Posted by mongreloctopus View Post
Hi there,

I bought a replacement crush washer for my oil change, dimensions per this thread: https://www.triumphrat.net/air-coole...ml#post1500984

However, when I removed the drain plug, I noticed that the crush washer that came out was 3mm in thickness, instead of 2mm. Since this was the first oil change and the washer looked to be in good condition I just re-used it, but for next time, does a 1mm difference in thickness matter? I imagine that using a thinner washer will just mean the plug is screwed in a wee bit more but I want to make sure.

Thanks!
The 1 mm difference doesn't matter, you're right the plug will just be screwed in a touch farther.

Speed Twin is probably correct, but I replace mine each time as well. Bought a bag of 50 of them at some point for very little money.
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post #7 of 28 (permalink) Old 11-03-2019, 02:10 PM
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Quote:
Originally Posted by StreetTwin View Post
In fifty years of motorcycling I have yet to replace a drain plug washer. It's not about being frugal, it's about not replacing parts needlessly.


Ah ... thatís the reason I slipped as I walked up your driveway this afternoon!
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post #8 of 28 (permalink) Old 11-03-2019, 03:15 PM
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Hey, it's a Triumph. Want to keep things authentic.
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post #9 of 28 (permalink) Old 11-04-2019, 11:39 AM
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I've reused the washers on cars and motorcycles for years. I do tend to turn it over each time.

Worse case - it oozes a little. But probably not.
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post #10 of 28 (permalink) Old 11-04-2019, 09:34 PM
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I can't believe how many tight arses are on here who will not replace a simple drain plug washer for something so important yes I can be a tight arse myself on things but something that will leave the oil where it suppose to be kept and there is a good reason why they recommend replacing it each time, well they aren't going to get rich quick from a 50c washer anyway.
I have a full set of copper drain plug washers for all my needs for my cars and bikes, but as I say I get new washers thrown in when I buy my new filters for my Thruxtons and I always buy my filters from my dealer yes I pay a little bit more but at lease I know they fit and never leak.

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