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Torquing bolts

  • Thread starter Thread starter the1pig
  • Start date Start date
T

the1pig

Guest
OK here is another newbie question but thank you for your help. If there is not a Spec for certain bolts to be torqued what is the standard? Just hand tight?

Thanks again for all you help.

I will start putting her back together tomorrow baring any unforeseen difficulties.
 
Depends on the size of bolt & what it's going into... Can you be more specific?

Dan :)
 
not really it is more of a general question. i am doing a top end rebuild and getting ready to put it back together.

I noticed some bolts like the cam chain guides do not have recommended torque specs.
 
there should be a table of torque values listed in the manual as standard for each given diameter and thread pitch. these are the values to use when there isn't one called out for the specific location / application.
 
Here is a copy of the chart that 76FJ55 was talking about, taken from the factory 850 manual:

Torquechart.jpg


.
 
Do them up till they break or strip ,then back them off half a turn.:pCheers,Simon.
 
well the air impact is o.k. but a four foot torque wrnech is beettr. cause you know how much .. power your useing..for over tightening.. you know the ones they use on massive diesil ships..
 
simon kuether said:
Do them up till they break or strip ,then back them off half a turn.:pCheers,Simon.
Click to expand...

:clap: That is why I love this site the years of personal experience is better then any other shop I could call or book I can read. Thanks for the information.
 
marz said:
well the air impact is o.k. but a four foot torque wrnech is beettr. cause you know how much .. power your useing..for over tightening.. you know the ones they use on massive diesil ships..
Click to expand...
Did you say "massive diesil ships"?
Here is an engine for one:
rta96c_crank.jpg


rta96c_cyldeck.jpg





mighty13d said:
Then it's time to dig out the 'liquid wrench'. AKA, oxy-acetylene torch!
Click to expand...
"Liquid Wrench" is NOT the same as a torch.

LG_L106.JPG


By the way, the oxy-acetylene torch is more-commonly known as a "blue-tipped wrench". :D​

.​
 
the1pig said:
:clap: That is why I love this site the years of personal experience is better then any other shop I could call or book I can read. Thanks for the information.
Click to expand...

I never back them off once stripped, no use. Spot weld them:p
 
Our fastener distributor put on a little symposium on nuts and bolts. Accd. to him, torque specs apply to NEW hardware only. Any anti-seize or loctite on the threads will give a false reading. Torquing old stuff will normally get you close.
 
hampshirehog said:
I've got plans to pop one of these motors in my PC50 - she might make over 40mph then....
Click to expand...
She might make over 40 mph, but not for long. You're gonna have to stop for fuel every so often too.

Check out the rest of the specs for the engine:

The Wartsila-Sulzer RTA96-C turbocharged two-stroke diesel engine is the most powerful and most efficient prime-mover in the world today. The Aioi Works of Japan's Diesel United, Ltd built the first engines and is where some of these pictures were taken.
It is available in 6 through 14 cylinder versions, all are inline engines. These engines were designed primarily for very large container ships. Ship owners like a single engine/single propeller design and the new generation of larger container ships needed a bigger engine to propel them.
The cylinder bore is just under 38" and the stroke is just over 98".
Each cylinder displaces 111,143 cubic inches (1820 liters) and produces 7780 horsepower.
Total displacement comes out to 1,556,002 cubic inches (25,480 liters) for the fourteen cylinder version.

Some facts on the 14 cylinder version:
Total engine weight:2300 tons (The crankshaft alone weighs 300 tons.)
Length:89 feetHeight:44 feet
Maximum power:108,920 hp at 102 rpm
Maximum torque:5,608,312 lb/ft at 102rpm
Fuel consumption at maximum power is 0.278 lbs per hp per hour (Brake Specific Fuel Consumption).
Fuel consumption at maximum economy is 0.260 lbs/hp/hour.
At maximum economy the engine exceeds 50% thermal efficiency. That is, more than 50% of the energy in the fuel in converted to motion.
For comparison, most automotive and small aircraft engines have BSFC figures in the 0.40-0.60 lbs/hp/hr range and 25-30% thermal efficiency range.
Even at its most efficient power setting, the big 14 consumes 1,660 gallons of heavy fuel oil per hour.

Let's assume a speed of 20 knots for the ship. That's just about 22 miles per hour.
Divided by 1660 gallons means that you will use about 75 gallons per mile. You will get about 70 feet per gallon.
Assuming about a 4-gallon tank on your bike, you will have to refill after travelling the length of a football field. :eek:

:D

.
 
Steve said:
She might make over 40 mph, but not for long. You're gonna have to stop for fuel every so often too.

Check out the rest of the specs for the engine:

The Wartsila-Sulzer RTA96-C turbocharged two-stroke diesel engine is the most powerful and most efficient prime-mover in the world today. The Aioi Works of Japan's Diesel United, Ltd built the first engines and is where some of these pictures were taken.
It is available in 6 through 14 cylinder versions, all are inline engines. These engines were designed primarily for very large container ships. Ship owners like a single engine/single propeller design and the new generation of larger container ships needed a bigger engine to propel them.
The cylinder bore is just under 38" and the stroke is just over 98".
Each cylinder displaces 111,143 cubic inches (1820 liters) and produces 7780 horsepower.
Total displacement comes out to 1,556,002 cubic inches (25,480 liters) for the fourteen cylinder version.

Some facts on the 14 cylinder version:
Total engine weight:2300 tons (The crankshaft alone weighs 300 tons.)
Length:89 feetHeight:44 feet
Maximum power:108,920 hp at 102 rpm
Maximum torque:5,608,312 lb/ft at 102rpm
Fuel consumption at maximum power is 0.278 lbs per hp per hour (Brake Specific Fuel Consumption).
Fuel consumption at maximum economy is 0.260 lbs/hp/hour.
At maximum economy the engine exceeds 50% thermal efficiency. That is, more than 50% of the energy in the fuel in converted to motion.
For comparison, most automotive and small aircraft engines have BSFC figures in the 0.40-0.60 lbs/hp/hr range and 25-30% thermal efficiency range.
Even at its most efficient power setting, the big 14 consumes 1,660 gallons of heavy fuel oil per hour.

Let's assume a speed of 20 knots for the ship. That's just about 22 miles per hour.
Divided by 1660 gallons means that you will use about 75 gallons per mile. You will get about 70 feet per gallon.
Assuming about a 4-gallon tank on your bike, you will have to refill after travelling the length of a football field. :eek:

:D

.
Click to expand...

HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAAH
that thing is so freakin sweet I want one so bad now.........HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA
 
So what's the torque spec on the connecting rod bolts?

In all seriousness, if you have access to a machinery's handbook, there are formulas for computing torque required based on either common joint loading, or a specified joint loading. I'm sure you can look up all kinds of formulas for those calcs on the net as well. It all depends on base metal, bolt material, and assumed bolt condition (new vs old). You can spec it to be torqued to the limit of thread ripout of the weaker thread, or you can spec it to obtain a desired normal force on the joint.
 
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