[AT] OT- Briggs and Stratton valve clearance

[k7jdj at aol.com]

Thanks Charlie,

That's been suggested by several others.  I like the challenge of the broken engine but at some point will likely just go with a Harbor Freight replacement.  The Briggs engine has a special gas tank that I replaced last year for what a replacement engine costs.  It is filled a a material that looks a little like Scotch bright.  This is to reduce issues caused by the extreme vibration. I hope to get back to repairs tomorrow.

Gary
Renton, WA


-----Original Message-----
From: charlie hill <charliehill at embarqmail.com>
To: Antique tractor email discussion group <at at lists.antique-tractor.com>
Sent: Fri, Jun 24, 2016 8:42 pm
Subject: Re: [AT] OT- Briggs and Stratton valve clearance

You can buy a 6.5 HP honda clone from Harbor Freight for about $100.00.
It should fit right in place of the B&S and it's a better engine.

Charlie

-----Original Message----- 
From: Dennis Johnson
Sent: Thursday, June 23, 2016 10:49 PM
To: Antique tractor email discussion group
Subject: Re: [AT] OT- Briggs and Stratton valve clearance

Gary,

Valve wear like what you describe are common on Brigg's engines. I have seen 
it several times. Not sure of the exact wear mechanism but my guess is that 
3/4 of the wear is on the valve, and the other 1/4 is on the hardened seat.
When you get  Brigg's that losses power when hot, that is the first thing to 
check.

Thanks,
Dennis


Sent from my iPad

> On Jun 23, 2016, at 9:23 PM, John Hall <jtchall at nc.rr.com> wrote:
>
> Maybe if that engine was built for leaded fuel, the lack of the "cushion
> deposit" the lead used to leave has allowed for the seats and valves to
> hammer themselves to the point you lost clearance?
>
> John Hall
>
>
>
>> On 6/23/2016 8:45 PM, k7jdj at aol.com wrote:
>> Not a lot of traffic so I thought I would post a question about a 70's 
>> vintage  5 HP Briggs engine.  The engine is used on a plate compactor so 
>> it is subject to extreme vibration.  I made the mistake of letting 
>> someone else use it and got a report that the engine was running 
>> extremely fast and you couldn't adjust the speed.  Quick check and it was 
>> obvious the throttle plate had fallen off the shaft.  Not an easy fix but 
>> after a lot of bad language I was able to reinstall with a new screw. 
>> The engine would not start.  It would try but just would not run.  I 
>> checked the compression and it was zero.  Pulled the head and discovered 
>> the intake valve was not closing completely.  Exhaust was OK but probably 
>> doesn't have enough clearance.  These valves are adjusted by 
>> filing/grinding the valve stem.  Not a big deal but I can not figure out 
>> why the valve clearance would decrease.  I can't imagine there can be 
>> enough valve/seat ware to reduce clearance nor the valve stem growing l!
o!
> ng!
>>  er so what am I missing?
>>
>> Gary
>>
>> Renton, WA
>>
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