Author Topic: Copper sealing washer 90441-333-000 cb350f  (Read 816 times)

Offline watty51

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Copper sealing washer 90441-333-000 cb350f
« on: June 27, 2020, 09:13:05 PM »
Hi All,
Can the 12 x copper sealing washers 90441-333-000 that fit under the cylinder head nuts be reused. Number 16 on picture.

Ds are asking 3.30 each so that’s £40 for 12 washers, unless that’s the “going” rate seems a bit pricey.

Has anyone else managed to get hold of these from another supplier, or are they a special type.

Cheers
Mark

Offline Johnwebley

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Re: Copper sealing washer 90441-333-000 cb350f
« Reply #1 on: June 27, 2020, 09:17:33 PM »
I don't know. But you could try annealing them.

Heat to cherry red then quench

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Offline mike the bike

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Re: Copper sealing washer 90441-333-000 cb350f
« Reply #2 on: June 27, 2020, 09:30:37 PM »
+1 on annealing them.
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Offline mike the bike

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Re: Copper sealing washer 90441-333-000 cb350f
« Reply #3 on: June 27, 2020, 09:33:58 PM »
Or you can buy 10 for £2.35
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Offline Nurse Julie

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Re: Copper sealing washer 90441-333-000 cb350f
« Reply #4 on: June 27, 2020, 09:35:09 PM »
+2 with using the old ones.
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Offline Nurse Julie

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Re: Copper sealing washer 90441-333-000 cb350f
« Reply #5 on: June 27, 2020, 09:36:01 PM »
Or you can buy 10 for £2.35
Or, you can also use Dowty type washers.
Im a Nurse, trust me, this won't hurt.....much !!!

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Offline watty51

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Re: Copper sealing washer 90441-333-000 cb350f
« Reply #6 on: June 27, 2020, 09:49:37 PM »
Thanks all for the quick response.

Will have a look at the options stated and make a decision.




Offline Oddjob

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Re: Copper sealing washer 90441-333-000 cb350f
« Reply #7 on: June 27, 2020, 10:07:52 PM »
Never annealed one yet and never had a leak, done so many I’ve lost count.
Don't play stupid with me, I'm better at it

Offline Moorey

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Re: Copper sealing washer 90441-333-000 cb350f
« Reply #8 on: June 27, 2020, 10:26:00 PM »
Or you can buy 10 for £2.35
Or, you can also use Dowty type washers.

What size are the Dowty seals Julie someone has just given me quite a few they measure about 11.2mm ID

Offline Bryanj

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Re: Copper sealing washer 90441-333-000 cb350f
« Reply #9 on: June 28, 2020, 05:05:45 AM »
I thought only 2 of the washers were sealing ones the rest ordinary ones

Offline gtmdriver

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Re: Copper sealing washer 90441-333-000 cb350f
« Reply #10 on: June 28, 2020, 07:31:55 AM »
+1 for Dowty Washers

Offline ttr400

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Re: Copper sealing washer 90441-333-000 cb350f
« Reply #11 on: June 28, 2020, 07:43:07 AM »
You can re-use the old ones, but i normally replace them.

The oem washers are not copper but copper plated steel. i have also re copper plated old washers before.

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Offline Oddjob

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Re: Copper sealing washer 90441-333-000 cb350f
« Reply #12 on: June 28, 2020, 12:51:30 PM »
I thought only 2 of the washers were sealing ones the rest ordinary ones

Same part number for all 12 Bryan so they either all seal or none does, I personally think they are there just to stop the head nuts digging into the soft alloy. The head studs are exposed on most of them anyway, you can see them through the fins so they ain't there to stop oil travelling up them.
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Offline Bryanj

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Re: Copper sealing washer 90441-333-000 cb350f
« Reply #13 on: June 28, 2020, 01:26:52 PM »
Two different part number according to CMSNL 90441-422-000(was377) Washer 8mm 10 reqd, 90442-377-000 Washer seal 2 reqd and they go under the two nuts with threads in the top

Offline Nurse Julie

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Re: Copper sealing washer 90441-333-000 cb350f
« Reply #14 on: June 28, 2020, 01:31:11 PM »
I could be wrong but the 350 and 400 have a different number of the copper washers fitted, 12 copper for the 350, 10 copper and 2 Dowty type on the 400. It may depend on which fiché / parts book you are looking at possibly.
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