6D108 - 2 Diesel Used Engine Blocks For Excavator PC300 - 6 Water
Cooling
Specification
| Car name: Engine cylinder block |
| Model Number: 6D108 |
| Engine type: Diesel |
| Application: Excavator |
| valve: 12 valve |
| Cooling: Water cooling |
| Injection: Direct |
| Work form: Turbo |
Description
Pinning Techniques
Straight threaded pins won’t seal a crack unless a heat-resistant,
ceramic-based thread sealer is applied to the threads and the tops
of the pins are peened over. Don’t use ordinary anaerobic thread
sealer on pins in or around the combustion chamber or exhaust ports
because it can’t take the heat.
straight threaded pin
Another type of straight threaded pin uses a special directional
thread with a shoulder at the top of the pin. The upward rake of
the threads produces a pinching or clamping effect when the pin is
tightened. This allows the pin to grip the adjacent metal more
tightly, which works well with thin wall castings. Special taps are
required with this type of locking pin to form the threads in each
drilled hole. It’s a two-step process, starting with a roughing tap
and followed by a finishing tap.
Tapered pins or plugs are installed in essentially the same manner
except that the depth of the pin is more critical for a proper fit.
A tapered pin is narrower at the bottom and wider at the top. It
works like a threaded pipe plug and wedges itself into the hole as
it is tightened. Tapered plugs require a special tap. Once each
plug has been installed, the top must be cut or ground off.
Some threaded pins have tops that are designed to snap off when the
plug is tightened. This saves the extra step of having to trim off
the top of the plug, but the torque on the plug can vary depending
on the diameter of the plug and the thickness of the casting.
For cracks that may spread under heat or load, “locks” can be
placed at intervals along the crack to stitch and hold the crack
together. Some locks have a bowtie shape while others are shaped
like a string of flattened beads. Locks are installed across the
crack (perpendicular to the crack) like shoe laces, with the
remainder of the crack filled in with overlapping pins.
