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Author Topic: dropped valve! YUCK!!!!  (Read 1478 times)

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boober

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dropped valve! YUCK!!!!
« on: April 11, 2007, 07:16:13 AM »
I'm moving this from the new member forum to here.... but here is the culprit that caused my problems, the little valve keeper retainer thingy just split in two.... i mean... whats the deal... its only 30 years old... everything should last forever right??
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kettlesd

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Re: dropped valve! YUCK!!!!
« Reply #1 on: April 11, 2007, 07:17:33 AM »
You do know the valve keepers are two-piece, right??
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boober

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Re: dropped valve! YUCK!!!!
« Reply #2 on: April 11, 2007, 07:18:49 AM »
not the keeper itself, the retainer washer thing with the tapered hole that makes the keeper work
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Offline DammitDan

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Re: dropped valve! YUCK!!!!
« Reply #3 on: April 11, 2007, 07:54:36 AM »
Are we talking #1 or #2 from the picture?

#1 are the valve keepers, #2 are the valve keeper seats.  If you're talking about #1, then it's supposed to come in 2 pieces to fit over the valve stem.
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CB750K4

boober

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Re: dropped valve! YUCK!!!!
« Reply #4 on: April 11, 2007, 01:00:22 PM »
#2 of course.... i know the keepers are 2 pieces.... the seats are obviously supposed to be one piece..... and therein lies the problem.... i haven't gotten the head off yet... maybe later tonight... if im lucky there will just be a little ding in the top of the piston.... and hopefully no other damage... luckily i wasn't going anywhere when it happened, just idling and got it shut off rather quickly.  from what i have read here new valves are hard to come by and quite expensive.  so i hope that isn't going to be required(wish me luck)
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boober

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Re: dropped valve! YUCK!!!!
« Reply #5 on: April 11, 2007, 05:56:23 PM »
Well thank you to all who crossed their fingers for me!  Looks like it did nothing to the piston but knock the carbon off in a spot... amazingly enough, the valve doesn't appear to be bent. But I will leave that determination to my machinist.  Does anyone know where to get a good gasket set? does honda still have em? And is there anything else that would be recomended to do since i have it stripped down this far???  Thank you all
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Offline bryanj

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Re: dropped valve! YUCK!!!!
« Reply #6 on: April 12, 2007, 05:01:25 AM »
If its out and head off you need to pull the cylinders and do the base gasket and I would change the cam chain and be very critical over the rubber rollers
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

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Offline jonbuoy

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Re: dropped valve! YUCK!!!!
« Reply #7 on: April 12, 2007, 01:51:48 PM »
Quote from: bryanj on April 12, 2007, 05:01:25 AM
If its out and head off you need to pull the cylinders and do the base gasket and I would change the cam chain and be very critical over the rubber rollers

I didn't realise the rollers were rubber till I got new ones from honda - mine felt like bakelite!
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Offline Big Jay

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Re: dropped valve! YUCK!!!!
« Reply #8 on: April 12, 2007, 02:40:13 PM »
Quote from: boober on April 11, 2007, 05:56:23 PM
  Does anyone know where to get a good gasket set? does honda still have em? And is there anything else that would be recomended to do since i have it stripped down this far???  Thank you all

Is this a 750?
http://cbrzone.com/gaskets.html

Have never seen a retainer broken in two.

Jay
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