Cadmandu

Hi all
How do you know when you are at tdc compression so can measure the clarancec?

Hobbsy

My Feedback: (102)

Since you're going to have the rocker cover off just turn the engine in it's normal direction and watch the intake valve open then close and turn about 120 more degrees. Easier, is to do this with the glow plug out and when the intake valve closes insert a small stick into the glow plug hole and feel the piston come up to the top. There are many other ways.

I grew up south of you in Hookstown.

Cadmandu

Thanks I'm having an awfully hard time getting a .003 feller gauge under that rocker. I grew up in Hollidaysburg PA what is the torque values on he head do you know?

Hobbsy

My Feedback: (102)

I use this guy and set them to a about 10 to 12 inch pounds. It's more important that they be tightened equally than to an exact torque.

Cadmandu

Nice where did you get that tool? Do you have to cut off Allen wrenches to adapt?

Hobbsy

My Feedback: (102)

I've had that for 20+ years and it is no longer available.

Jesse Open

Similar devices have been available and are still very available.
Precision Instruments
https://www.amainhobbies.com/gforce-...content=Brands

https://www.kctoolco.com/wiha-28506-...24126.99%20USD

Cadmandu

Thanks I will chech they out. I found some used on eBay as well. Do you know how many in pounds is neefed on the ticket nuts? If I find a torque wrench that starts at 10 inch pounds and I want to measure between 10 and 12 is this too big.


this is a os fs 40

Hobbsy

My Feedback: (102)

Back plate bolts and your rocker cover bolts take about half what this chart says. Their thread engagement is just too short.

Cadmandu

That is a nice chart do you have the site so I can print it out.?

Hobbsy

My Feedback: (102)

http://spiritsofstl.com/Documents/In...gy,%20Inc..pdf

You may need to enlarge it to see it clearly.

Hobbsy

My Feedback: (102)

Gary would you please clarify this for me: (values from 2 to 8 KGF.M), it appears to me that it should read KGF.MM. Thanks

Jesse Open

Never seen a kgf.mm spec. More likely they left out the decimal points on the pounds force foot side.
.2 lbf.foot equals 1,44 kgf.m and .8 kgf.m equals 5.78 lbf.ft
1 kgf.m = 7.233014 lbf.ft

Hobbsy

My Feedback: (102)

Don't read this just yet: OK read it now

According to this: https://www.translatorscafe.com/unit...-force%20inch/

2 KGF.M===2,777 oz inch, 2 KGF.MM===2.777 oz inch. which seems more realistic.

The GForce 6 in 1 Torque Driver Set is a revolutionary product, developed for drivers that demand perfection. This driver allows the user to set specific torque values from 2 to 8 KGF.M, so once you determine the correct value for each screw, you can tighten it to the exact same tension every time. This will help to prevent stripped screws, tweaked components, and adds a level of precision that the RC world has never known.

Cadmandu

Thanks that will be perfect. How do your the Allen wrenches in the torque driver or do you it 1/4 drive metric Allen wrenches

Hobbsy

My Feedback: (102)

It came with a full set of metric and English, 8 of them.

Jesse Open

Never seen a kgf.mm spec. More likely they left out the decimal points on the pounds force foot side.
.2 lbf.foot equals 1,44 kgf.m and .8 kgf.m equals 5.78 lbf.ft
1 kgf.m = 7.233014 lbf.ft
Edit above: I transposed the units
.8kg.m equals kg.f equals 1.44 lbf.ft

That would make the range in Lb/Ft 1.44 to 5.78

The kgf.mm makes perfect sense for small fasteners in that case Dave.

Hopefully the links helped...

jaka

Hi!
All OS four strokes have a T-mark on the drive washer that should line up with a mark on the crank case when the piston is at top dead center.