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Briggs Model Q Teardown


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  #1  
Old 06-11-2019, 08:09:51 PM
Mike Stroz Mike Stroz is offline
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Default Briggs Model Q Teardown

Just picked up a pretty nice Briggs Model Q, serial number in the 5000's, and it seems like it's been sitting so long it's rusted up inside. It turns over but it's a little crunchy. Never seen a Q before, what's the procedure to get it apart? I can see the base unbolts but I haven't done anything but pull the head to reveal some somewhat crusty valves
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Old 06-11-2019, 09:03:52 PM
uglyblue66 uglyblue66 is offline
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Default Re: Briggs Model Q Teardown

I have a rough but fairly complete Q.The flywheel was run loose and ruined the flywheel and crank.I have only got a glimpse of it in the past 10 years as it is on a shelf in behind a couple B's and some other stuff.
I had no idea they were scarce when I paid 75 bucks for it 20 years ago.I thought I could scratch up a crank and flywheel easy and cheap. I have not looked that hard but have not seen any just laying around.
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Old 06-11-2019, 09:21:08 PM
Mike Stroz Mike Stroz is offline
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Default Re: Briggs Model Q Teardown

I can imagine parts are hard to come by. This one seems to be in good shape which is why I'm even trying to save it. The cam isn't wiped out and it has good compression. I'm thinking it was just stored in a humid place for a bunch of years without any oil circulating to keep the rust at bay.
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Old 06-11-2019, 09:50:45 PM
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Default Re: Briggs Model Q Teardown

How bad are the flywheel and crank? I'd think a repair could be effected. Even if it means machining a tapered sleeve...

That's pretty cool. I don't have anything that rare. Some ZZs, a B, a WMB. Do have a water cooled Z / ZZ that's pretty neat

Keith
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Old 06-11-2019, 10:06:37 PM
uglyblue66 uglyblue66 is offline
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Default Re: Briggs Model Q Teardown

Not meaning to highjack but it is my K I would really like to get running.It is close but never hit a lick.
I don't know when I will get time in the near future to dig that Q out. Maybe I should.
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Old 06-11-2019, 10:52:24 PM
K-Tron K-Tron is online now
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Default Re: Briggs Model Q Teardown

With any valuable, rare old engine, it is best to be as gentle as you can with disassembly. I have submerged many stuck engines in my ultrasonic cleaner and pulled out clean free engines. This process strips paint, so it may not be for you. I'd suggest using plenty of pblaster or kroil to help you disassemble the engine for proper inspection. I would not run an engine of that age without first pulling the piston and rod to check for stuck rings.

Chris
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Old 06-11-2019, 11:14:19 PM
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Default Re: Briggs Model Q Teardown

Vanman- Any water cooled Briggs are uncommon!

Uglyblue66- bring your engine to the Boone this summer to the show.
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Old 06-12-2019, 08:51:42 AM
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Default Re: Briggs Model Q Teardown

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Originally Posted by Mike in NC View Post
Vanman- Any water cooled Briggs are uncommon!

Uglyblue66- bring your engine to the Boone this summer to the show.
Which 1? the Q or the K?
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Old 06-12-2019, 10:28:13 AM
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Default Re: Briggs Model Q Teardown

Which ever you would like, or even both of them. Bring a whole load. The more the merrier!!
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Old 06-12-2019, 01:44:25 PM
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Default Re: Briggs Model Q Teardown

I think I'm going to do a minimal teardown of the internals and hopefully get all the rust cleaned up. I'll probably open it up, pull the piston and rod, and the valves, but leave the rest together because I feel like I'll break something if I go too far. Does anyone know the correct torque for the rod bolts?
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Old 06-12-2019, 04:36:10 PM
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Default Re: Briggs Model Q Teardown

Looks like 190 in/lbs.
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Old 06-12-2019, 07:37:54 PM
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Default Re: Briggs Model Q Teardown

Perfect, thanks.

I just tore into it, did a valve job, cleaned the sludge out of the bottom end, honed the cylinder, etc. and I only realized the issue when I was putting it back together- the rod was snapped at some point and someone brazed it back together! Looks like it ran low on oil, seized, and broke the rod at the crank. No other damage or botched repairs to speak of, but it looks like I need a new rod if anyone has one. I'm not entirely confident the one in it is original but it says 652/6-2, the / may be a 7 but it's really hard to tell. If anyone has one my crank measures 0.999"

Last edited by Mike Stroz; 06-12-2019 at 08:22:52 PM.
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Old 06-12-2019, 08:20:44 PM
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Default Re: Briggs Model Q Teardown

Here is my Q. It took me about 30 minutes to dig it out!
Serial number is 1747
It has a Tillitson carb with it. Or it slides onto that peice on the engine anyway? I am purty sure it was on it when I got it.Tightens with a screw and nut.
it appears to have been painted orange along time ago.
it is not stuck,but I could not turn it enough to see if it had compression. The keyway is wallowed out and I want to say the taper is worn.I will have to hunt a bit more to see if the nut and all is handy for it,I felt lucky to find what I did for it.It has been here over 20 years and has been on the shelf as you see purty much since 2006.
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Old 06-12-2019, 08:25:39 PM
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Default Re: Briggs Model Q Teardown

Quote:
Originally Posted by uglyblue66 View Post
Here is my Q. It took me about 30 minutes to dig it out!
Serial number is 1747
It has a Tillitson carb with it. Or it slides onto that peice on the engine anyway? I am purty sure it was on it when I got it.Tightens with a screw and nut.
it appears to have been painted orange along time ago.
it is not stuck,but I could not turn it enough to see if it had compression. The keyway is wallowed out and I want to say the taper is worn.I will have to hunt a bit more to see if the nut and all is handy for it,I felt lucky to find what I did for it.It has been here over 20 years and has been on the shelf as you see purty much since 2006.
That doesn't looks too bad, mine is only missing the air cleaner and it was painted black, silver, red, green, and yellow for some reason. I bought it, a WA, a Y (I think), an LA, and an H parts motor for $250 a couple days ago including a couple boxes of NOS rings, pistons, valves, and a couple rods that unfortunately won't work for me..
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Old 06-12-2019, 08:47:52 PM
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Default Re: Briggs Model Q Teardown

Man did you get a deal!! The WA is not common.
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Old 06-12-2019, 08:57:02 PM
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Default Re: Briggs Model Q Teardown

Quote:
Originally Posted by Mike in NC View Post
Man did you get a deal!! The WA is not common.
I thought so! I'm probably going to be selling the WA since I have the very similar Q but I'll see if I can get it going first. It's really clean but no spark, I'm thinking the condensor on it is bad.
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Old 06-12-2019, 09:26:44 PM
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Default Re: Briggs Model Q Teardown

How much for the WA?
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Old 06-12-2019, 09:52:58 PM
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Default Re: Briggs Model Q Teardown

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How much for the WA?
No idea, I've never seen one before
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Old 06-13-2019, 08:39:23 AM
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Default Re: Briggs Model Q Teardown

Looks like the part number for the rod I need is actually 66339, I'm not sure where the rod I have came from but it's definitely not for this motor. Maybe it's one that originally didn't have the oil splasher on the end but it was added?
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Old 06-13-2019, 07:50:37 PM
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Default Re: Briggs Model Q Teardown

I'm starting to think I might sell my Q as parts and keep the very similar WA, which I did get to pop a few times today and will be much less work.
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