Bent Valve testing


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littlebeaver
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Bent Valve testing

Postby littlebeaver » Tue Apr 28, 2015 11:29 am



I wanted to know how you guys test to see if your valve is bent or not,, I have a way but I wanted to hear from you to see how you tell if it's bend or not....



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Re: Bent Valve testing

Postby WingAdmin » Tue Apr 28, 2015 1:44 pm

littlebeaver wrote:I wanted to know how you guys test to see if your valve is bent or not,, I have a way but I wanted to hear from you to see how you tell if it's bend or not....


The simplest way is to check compression on the cylinder. If the valve is bent, it won't be seating, so there won't be any compression.

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littlebeaver
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Re: Bent Valve testing

Postby littlebeaver » Tue Apr 28, 2015 3:08 pm

Well I was playing around and cleaning up this extra head I got and I took the valves out,, clean everything up well, lapped the valves a little they seem to seat just right,,, I figure it like this,,, let me put a valve in my cordless drill and see how true it is,,, Wow, very nice, all 4 are just fine....

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Re: Bent Valve testing

Postby WingAdmin » Tue Apr 28, 2015 3:11 pm

Oh, you're talking about a valve when it's NOT in the engine.

Get a mirror or piece of glass, and roll the valve stem along the glass. If it's not perfectly straight, you will likely be able to tell.

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Re: Bent Valve testing

Postby roadwanderer2 » Tue Apr 28, 2015 3:15 pm

littlebeaver wrote:Well I was playing around and cleaning up this extra head I got and I took the valves out,, clean everything up well, lapped the valves a little they seem to seat just right,,, I figure it like this,,, let me put a valve in my cordless drill and see how true it is,,, Wow, very nice, all 4 are just fine....


sounds like a nice idea, but i hope you have that valve perfectly centered in the drill chuck so it spins true. be careful, looks can be deceiving.

stuart.

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Re: Bent Valve testing

Postby littlebeaver » Tue Apr 28, 2015 3:20 pm

I found myself getting dizzy doing it like that,, lol I just placed it in the drill and spun that sucker,,, I Am a happy camper with all 4 of them... See I have that ticking sound coming from one of the valves on the bike, the right side, one guy over at the Saunders site seems to think it's the end of the valve worn down,, I have readjusted the valve probably enough times now to confirm the gaps,, it's not that.. I am going to pull the head and investigate...I wanna find this issue once and for all...

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Re: Bent Valve testing

Postby roadwanderer2 » Tue Apr 28, 2015 3:25 pm

just a thought here...........is it possible that the cam lobe that moves that valve up and down is just a tad worn round giving you that valve tap sound?

stuart.

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Re: Bent Valve testing

Postby littlebeaver » Tue Apr 28, 2015 3:31 pm

I will check that when I Remove the head off the bike later today.... I gonna be investigating everything...May be a worn valve or a broken spring or a issue with the tappets, or maybe the cam lobe is worn...thanks I will see...In any case that head is gonna get replaced....The valves are not bent on the bike because I did a compression test and it shows good readings, so it's gotta be something other than...A worn cam lobe can present a wrong reading or a inaccurate reading so I will check the spec. on the lobe,,, yes...
Last edited by littlebeaver on Tue Apr 28, 2015 3:38 pm, edited 1 time in total.

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Re: Bent Valve testing

Postby roadwanderer2 » Tue Apr 28, 2015 3:37 pm

cool, let me know what you find once you have it off the motor. and now its time for me to go make me somthin to eat. im houngre :P.

stuart.

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Re: Bent Valve testing

Postby littlebeaver » Tue Apr 28, 2015 9:50 pm

I burned our dinner that was on the grill tonight... :shock: I'm stupid... :shock: I learned something tonight.... :shock: you can't work on your motorbike and grill chicken breast at the same time... I ruined $10.00 worth of breast meat that was marinated to be very flavorful... Gosh darn it.... I Was dismantling my bike to get my right cylinder head removed.... I am going to show and tell...MY wife gets home and I had to tell her to take the daughter out for supper....ugggggg :twisted: I toasted the bird... IT was crunchy... :lol:
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paint has been on there for several years now (5)
paint has been on there for several years now (5)

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Re: Bent Valve testing

Postby littlebeaver » Wed Apr 29, 2015 1:40 am

Well, the freak cylinder head is off tonight or this morning,,, Came off without any issues, didn't cuss once...
this is too much fun... I see why you guys like this kinda stuff so much now... I hope I find out why it's clicking tomorrow...
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I enjoy wrenching,  I Just love it...Gonna get to use my torque wrench again...lol
I enjoy wrenching, I Just love it...Gonna get to use my torque wrench again...lol

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Re: Bent Valve testing

Postby Johnyy Smoke » Wed Apr 29, 2015 4:39 am

Remember to use sealer on the Cam oil seal- might keep you from opening it up again! Cheap insurance. Regards, Johnny

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Re: Bent Valve testing

Postby roadwanderer2 » Wed Apr 29, 2015 7:18 am

'mornin beave:

so sorry to hear about your chicken lol. nope, ya cant work on a bike and cook at the same time, it don't work, but glad you finally got the cylinder head removed. from looking at it i have to say something doesn't look right. its all carbonized especially in that one side. was the head gasket broken by any chance? was it burning any oil? your gonna need a good wire wheel to clean all that up with. let us know what you find after you pull the valves out and inspect the cam on that one side.

stuart.

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Re: Bent Valve testing

Postby virgilmobile » Wed Apr 29, 2015 9:10 am

Inspect not only the valve but the cam lobe and the rocker pad for a flat spot.
Do not mix up the rockers...There worn in a pattern to the rocker and valve.
That is unless you have somebody resurface them like new again.

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Re: Bent Valve testing

Postby littlebeaver » Wed Apr 29, 2015 9:48 am

I am pretty sure that the valve seals are bad, they will be replaced...Thanks for the advice...

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Re: Bent Valve testing

Postby littlebeaver » Wed Apr 29, 2015 7:30 pm

I didn't touch my cylinder head that came off my bike yet,, It's gonna stay out there until I finish playing with my other one.., I am changing out the valves and springs and cam shaft, and rocker assembly though, I cleaned up and resurfaced the head I bought from my friend today.... There were some spots I just could not get clean so I resurfaced it just a tad....Beavers' machine shop...I also got some lapping compound and a lapping tool which is useless but I figured a great way to make it useful... anyway the seats are looking good, I shot some wd40 in on top of the valves inside the head to see if any leaks would occur, nope, no leaks. Tomorrow I will play with the problem one see whats up..
the cylinder head I got from my friend.. It's cleaned up mostly but I want it new..
the cylinder head I got from my friend.. It's cleaned up mostly but I want it new..
My glass table, I flipped it oer to use the bottom side as it's smooth and flat, added sand paper and went to work.
My glass table, I flipped it oer to use the bottom side as it's smooth and flat, added sand paper and went to work.
Looks kinda good
Looks kinda good
Lapping tool is a great idea but that suction cup never stayson well,  I placed some Velcro on the valve head and the cup,,, that little sucker spins like the dickens now....
Lapping tool is a great idea but that suction cup never stayson well, I placed some Velcro on the valve head and the cup,,, that little sucker spins like the dickens now....
This is just right down fun...
This is just right down fun...
...
Last edited by littlebeaver on Wed Apr 29, 2015 8:20 pm, edited 2 times in total.

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Re: Bent Valve testing

Postby roadwanderer2 » Wed Apr 29, 2015 7:34 pm

very nice work beave, that head looks really good. im sure when you getter back together its gonna run nice and smooth. i have a question...exactly what does the lapping tool do. I've never used one.

stuart.

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Re: Bent Valve testing

Postby littlebeaver » Wed Apr 29, 2015 7:45 pm

the lapping tool is designed to stick to the top of the valve and you spin it by hand to create a new seat in the cylinder head a new mating surface, you should oil the valve well and try not to get any compound on the shaft of the valve,,, keep the stuff only where it's needed,, the lap tool doesn't stay on the head well,, you spin it as if you were starting a fire using a stick between your hands,, the Velcro is my idea to keep the freakin thing where I want it and I can spin it all I want.. works well.....Some guys use a drill from the other side,, probably not too wise but some do a good job doing it that way.. I do this old school and probably the correct way...But yeah thanks, the head came out gorgeous... Stuart you can see lots of lapping at youtube...Just got an idea ,,, if a guy had another valve (straight) he put Velcro on the head of the valve in the head and put another valve in his drill and place Velcro on it and lap it from the top side using a drill...Nice and easy like... the Velcro would hold it so you could go up and down.. Cool man..I might try that...

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Re: Bent Valve testing

Postby littlebeaver » Wed Apr 29, 2015 8:08 pm

virgilmobile wrote:Inspect not only the valve but the cam lobe and the rocker pad for a flat spot.
Do not mix up the rockers...There worn in a pattern to the rocker and valve.
That is unless you have somebody resurface them like new again.

OK I shall not, I will complete the right side first side then go after the left :lol: ....I am having a great time... :D
Last edited by littlebeaver on Wed Apr 29, 2015 11:55 pm, edited 1 time in total.

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Re: Bent Valve testing

Postby littlebeaver » Wed Apr 29, 2015 8:12 pm

Johnyy Smoke wrote:Remember to use sealer on the Cam oil seal- might keep you from opening it up again! Cheap insurance. Regards, Johnny

OK thanks Johnyy, hey, the valve seals just pushes on from what I can tell, correct, dry or oil them first?

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Re: Bent Valve testing

Postby littlebeaver » Wed Apr 29, 2015 8:14 pm

Virgil, that ticking was making me crazy,, I remember your post about it a few years back,, I shall seek and destroy the problem... :lol:

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Re: Bent Valve testing

Postby sportsfreaked » Wed Apr 29, 2015 8:29 pm

Hey man are you doing this as a nod towards me lol. I have all the lapping tools and the different "pastes". You should have said something I would have brought them over.
Thanks to all who answer and help. It is greatly appreciated!
Ed

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Re: Bent Valve testing

Postby littlebeaver » Wed Apr 29, 2015 9:24 pm

Dog gone it,, oh well ... I didn't hear back from my friend about your lid today,, I guess he doesn't have one....He said he wouldn't call if he doesn't find one..

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Re: Bent Valve testing

Postby spiralout » Wed Apr 29, 2015 10:59 pm

Don't forget about this while you've got the head off.

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Re: Bent Valve testing

Postby littlebeaver » Wed Apr 29, 2015 11:39 pm

Yeah that Fogey Gent is pretty creative... I read that along time ago, just after he posted it,, thought it was very smart... Thanks for the advice...




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