Re-torquing QL head bolts

[ironman]

I got a Quiet Line 1200 that I went to mow with this morning, got about 10 feet, ka-pow & died. I was pretty sure it was the head gasket and tore into it immediately.

Now if your familiar with Quiet Lines you know that everything fits together like a jigsaw puzzle, i.e.
can't remove the head without removing the tin shroud covering the head,
can't remove the tin shroud without removing the gas tank & brackets,
can't remove the tin shroud without removing the aluminum and tin heat box parts,
can't remove the aluminum heat box part without removing the muffler,
removing all of the above is a lot easier if the hood and grill are removed.

So when I got all that removed I found one head bolt completely backed out and all the others were barely past finger tight, and yes the head gasket was history.

Now I rebuilt this engine 10 plus years ago so I know that the head gasket was new and the bolts torqued to specks.

However, because of what it takes to even see the head bolts, as described above, I never re-torqued them.

I know everyone advocates a heat cycle or two and then re-torquing the head bolts, but you gotta tear half the tractor apart to begin with, then put it all back together just to even start it, then tear it all down again to re-torque.

Do any QL gurus out there have any tips or tricks that make the process more manageable?

[athomas]

I feel your pain and have done it as you described several times on that series !

[ol'George]

Run the engine a couple of heat cycles with the cooling covers off ( paying attention not to heat the engine above common sense)
then retorque.
An engine will not get overheated just running without a load.
BTDT.

[Workingstiff]

Originally Posted by ol'George

Run the engine a couple of heat cycles with the cooling covers off ( paying attention not to heat the engine above common sense)
then retorque.
An engine will not get overheated just running without a load.
BTDT.

Agreed..... I end up running without all the extras until, I find an available "round-tuit"

[PBIjim]

When I worked in a motorcycle shop, I had a little "IV" tank that I used to temporarily feed fuel to engines that I was working on. Basically, it was a small tank that I would hang up high so that it would gravity feed the fuel. It had a shut off valve & 6 feet of 5/16" rubber hose coming off it. My tank happened to have originally been a coolant tank that I recovered from a wrecked bike, but any little 4 to 8oz tank would work. I've also started motors with jumper cables when I didn't want to take the time to wire up everything for a quick test. NAPA used to sell a start button with alligator clips on it for just that purpose. I haven't seen one of those on the shelf in decades. There's probably some safety reason for that. I've seen guys run an aircraft engine on a bench. I wouldn't think that a garden tractor engine would be super challenging, but then again, I've never worked on a quiet line, so perhaps my perspective leaves room for improvement.

[ironman]

All good suggestions, thanks everyone.
I think what I can do, as long as I don't operate the tractor, is to just set the tank in place and just slip the muffler on without tightening the clamp.

The question then becomes what would be considered a good heat cycle time wise and at what RPM should the engine run?
One heat cycle or two?
Re-torque when hot, warm, or cold?

[ol'George]

Maybe 10 minutes running time in normal summer temps and various speeds. you don't want to run 3600, but idle is not fast enough.
Id say when the oil is way too hot to touch, you have reached desired heat.
Let it cool to the touch and retorque.
There is no set number of times to do this and or temps.
common sence is the best plan.
And FWIW:
There are one hell of a lot motorcycles that are air cooled, both two smoke and 4 that never had any kind of forced cooling and lived for many moons, AND did a lot more idling that the rider was comfortable with on a hot day.

[ironman]

Thank you, Young Man!

[athomas]

I usually do two heat and cool cycles ,re-torque when cold

[ol'George]

Originally Posted by ironman

Thank you, Young Man!

Ha,LOL old Fart is more like it, have fun.