Author Topic: 27 hp vanny bent valve ?  (Read 9504 times)

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Offline 2budzracing

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27 hp vanny bent valve ?
« on: April 09, 2011, 12:51:06 pm »
a friend has one that sears is fixing..they say it bent a valve and broke the cam ??? what woulud cause this ? I haven't seen it yet just going by what the tech told them.....
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Offline birdman_express

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Re: 27 hp vanny bent valve ?
« Reply #1 on: April 09, 2011, 02:30:51 pm »
The piston hit the valve, bends them everytime.
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Offline 2budzracing

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Re: 27 hp vanny bent valve ?
« Reply #2 on: April 09, 2011, 02:45:20 pm »
Marc know that part duh, but what would break the cam? I'm guessing the cam broke first and held it open.
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Offline birdman_express

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Re: 27 hp vanny bent valve ?
« Reply #3 on: April 09, 2011, 03:05:56 pm »
Most times, if the valve gets bent, the retainer came off.
If the cam broke, I wouldn't be surprized, that is the nature of the spoker cams.
If the cam broke, then the rods got into it, or the rod broke first
and got into the cam. I have seen that in grass cutters. If the
cam gets hit in the right spot in valve timing, it will bend a valve.
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Offline 2budzracing

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Re: 27 hp vanny bent valve ?
« Reply #4 on: April 09, 2011, 03:43:11 pm »
well they didn't mention anything about a rod, they just ordered a cam and valve.tried to get her a brand new motor through sears warranty but their gonna fix it........bet it does it again.got another 6.5 in here that was put together wrong from the get go,ding in the crank main journal(didn't really hurt the case!) and broken rings after only about 10 hr.s think the 6.5 was assembled around 4:30 on a friday..:(
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Offline GRUBDIGGER

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Re: 27 hp vanny bent valve ?
« Reply #5 on: April 09, 2011, 07:23:02 pm »
did ya check the valve guides? they move when overheated.
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Offline 2budzracing

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Re: 27 hp vanny bent valve ?
« Reply #6 on: April 09, 2011, 09:32:18 pm »
this is my understanding without seeing the motor....(again just questioning the sears tech) how could a stuck open/bent valve cause the cam to break.....just wondering if these engines have' cam break' problems on a stock grass cutter ....was hopeing to get a useable engine to hop up out of this deal.
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Offline GRUBDIGGER

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Re: 27 hp vanny bent valve ?
« Reply #7 on: April 09, 2011, 09:37:10 pm »
the came wont break. never seen that. on the singles i have seen the cam lobe on the exhaust become an circle.
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Offline fordman21

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Re: 27 hp vanny bent valve ?
« Reply #8 on: April 09, 2011, 11:35:26 pm »
The cam castings are junk and getting worse.
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Offline George Herrin

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Re: 27 hp vanny bent valve ?
« Reply #9 on: April 10, 2011, 11:25:38 am »
this is my understanding without seeing the motor....(again just questioning the sears tech) how could a stuck open/bent valve cause the cam to break.....just wondering if these engines have' cam break' problems on a stock grass cutter ....was hopeing to get a useable engine to hop up out of this deal.

EASILY IF the piston did indeed hit it then it was out of time (meaning not where it usually is or it would not have hit it) then the piston shoved it back in the opposite direction when it wasn't supposed to go back thus shoving the lift back into the cam at the worng time something has to give IE bent push rod bent and or broke valve bent and or broke cam.
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Re: 27 hp vanny bent valve ?
« Reply #10 on: April 10, 2011, 02:09:21 pm »
It prolly broke the timing belt, might have bent a Tiger rod too!
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Offline Huffy044

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Re: 27 hp vanny bent valve ?
« Reply #11 on: April 10, 2011, 02:12:51 pm »
Also dont forget there is no longer the oil additive in oil that used to be in there to protect tappets, since everything is now roller in the Automotive world and it's no longer needed, they dropped it.

Diesel oil and some high performance stuff still has it, so just use diesel oil, (or synthetic) it just has a little more soap to keep the engine clean, and that's not a bad thing.
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Offline 2budzracing

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Re: 27 hp vanny bent valve ?
« Reply #12 on: April 11, 2011, 10:35:55 am »
well when he comes back this week I gonna ask him to see what he replaced. is the 27 the same basic motor as a 16? I was gonna hop one up but I want to know the weak links beforehand!
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Offline anzadon

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Re: 27 hp vanny bent valve ?
« Reply #13 on: April 11, 2011, 11:30:20 am »
is the 27 the same basic motor as a 16?

NO! There's 11 HP difference!

Offline 2budzracing

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Re: 27 hp vanny bent valve ?
« Reply #14 on: April 11, 2011, 11:47:41 am »
HA HA Don..... :bash: never had one of those apart yet just was wondering....
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