Valve hit Piston! Help

kregan87 · #1 (**permalink**) 07-09-2012, 04:33 PM

hey guys, just had my rear cylinder head rebuilt over the winter. new valve seals cuz it was leaking a little oil. anyways put about 2500miles on it so far this year. just drove about a mile down the road and wabanG!!! trailer home and took it apart asap. valve spring broke, the 2 part clip? that holds the broke into four pieces and vavle marred up piston pretty good? and idea? faulty parts? crank still moves smoothly so im assuming rods are fine. maybe a faulty head rebuild? any thoughts guys

Batto · #2 (**permalink**) 07-09-2012, 05:02 PM

you say a valve spring broke, have you missed any gears and over revved it. Also did they put in new collets to hold valves in,Sounds like they may have used the old collets.

kregan87 · #3 (**permalink**) 07-09-2012, 05:16 PM

Not sure of they did. Valve is bent also. I ride hard sometimes but don't beat the s'not out of it. Just use the 113". By volleys do you mean keeper that hold the spring? Also haven't had any issues with my timing bu a friend mentioned that as well. Don't think that's it

06 pitbull · #4 (**permalink**) 07-09-2012, 05:44 PM

disamble & check everything.... make sure the crankshaft wheels didnt move..as most are just pressed on..unless you had them welded.. also check the rods.... bearings ect....

kregan87 · #5 (**permalink**) 07-09-2012, 05:45 PM

collets* sorry smartphone typing

RB Donovan · #6 (**permalink**) 07-09-2012, 05:54 PM

Valve locks are not a problem, unless you have broken ones.
As long as you are not using aluminum retainers, then there should be no problem there either.
Without seeing all the parts I would guess a bad valve spring.
Also, how much seat and nose pressure do you have?
How much lift, and how much before coil bind?
Is the cam timing correct? Or has something moved?
I doubt you've hurt the piston, but you still have to make sure you didn't pinch a ring land.
Rocker needs checking, pushrod needs to be checked, lifter needs checking, and also the camshaft needs looking at.
All these things and more need attention.

kregan87 · #7 (**permalink**) 07-09-2012, 06:30 PM

yes one of the keepers for the springs did break in half. the other one was fine. but both were dislodged and spring broke in 3 places. valve bent and put a couple dents in the piston. dont know about all the other measurments. i didnt put the heads together. just assembled the motor. timing has not been adjusted in two years so i doubt its that. im just curious to what triggered it all. i was thinkking the bad spring and or bad keeper busted to pieces. guide and seal seem fine to the naked eye. pushrod is straight as an arrow. didnt check lifter. crank moves smoothly still.

Captain America · #8 (**permalink**) 07-09-2012, 06:46 PM

Since the pushrod is fine it sounds like spring failure to me, I'd have to see the piston to make a decision about it's worth. I would make sure the rocker on that valve was OK, if the valves were replaced when the head work was done I'd just replace that valve. No matter what, I'd replace all the springs, retainers, and keepers, also like stated above, make sure that your installed height is correct, that your retainers and keepers can handle the open pressure, and that you don't have a coil bind problem.

kregan87 · #9 (**permalink**) 07-10-2012, 04:10 AM

So it seems the consensus here is faulty parts. Ill talk to the guy who rebuilt the head over the winter and see what he says

Batto · #10 (**permalink**) 07-10-2012, 04:38 AM

I'd say it's most likely the collets or valve retainers have caused the problem you will need to check all the parts mentioned by others you should pull the barral and check damage to piston and ring lands, pain in the ass but better safe than sorry.. good luck mate.

RB Donovan · #11 (**permalink**) 07-10-2012, 08:10 AM

Good luck trying to get someone admitting to faulty parts, or poor workmanship.
You need to know answers to the questions submitted, before approaching anyone.

I'm not one to accuse any person, or business of wrong doing without knowing the facts.
As far as I know it may have been a small thing like valve adjustment that caused the problem

kregan87 · #12 (**permalink**) 07-10-2012, 01:55 PM

heres some pics, leme know what you guys think about the piston and maybe the cause or causes.

06 pitbull · #13 (**permalink**) 07-10-2012, 01:59 PM

I think it may have already been discussed... do you have a real high lift cam?maybe compressing the springs to much... were the pushrods OK?.... any valve guide damage...thats not good..

kregan87 · #14 (**permalink**) 07-10-2012, 02:10 PM

pushrods seem fine. they line right up with a straight edge and its the stock 640 cam that comes in the 113 ultimas.

RB Donovan · #15 (**permalink**) 07-10-2012, 03:44 PM

Piston doesn't look bad. Just make sure the top ring spins freely at the valve pocket.

A glance at the valve spring appears to be a behive spring. To my knowledge that's the latest design on the market.

A .640 lift cam ain't nothing to sneeze at. Again you need to know installed height, and coil bind.

The lock is a 10* lock which is good, but at a quick glance it appears to be a cast lock. You would be in better shape with a machined lock.

You most definitely need a new valve.

I would like to see pictures of the spring portion of the head, and the combustion chamber side of the head.

The only way to truly check a pushrod is to take it out and roll it on a flat surface. I like to use ca piece of glass.