BusMaintenance
Please Login
BusMaintenance

Questions and Answers for School Bus Maintenance
 
HomeHome  RegisterRegister  Log in  

Share | 
 

 VT365 Torque Spec for Injectors

View previous topic View next topic Go down 
AuthorMessage
Admin
Admin


Posts : 2
Join date : 2016-04-06

PostSubject: VT365 Torque Spec for Injectors   Thu Apr 07, 2016 9:54 am

VT365 Injector Torque Procedures

Install the injector and torque to about 24 ft. lbs. Then tap the top of the injector with rubber mallet ( This is VERY important, trust me!!!!!!) then re-set the torque wrench to 30 ft. lbs and then re-torque. And you’ll never have a problem..

Article Found By Mike Madonia
Tighten the Torx-40 headed hold down bolt until it doesn”t turn.
This bolt is being tightened into the cast iron area of the head, so
stripping threads is NOT A CONCERN. If you are using the long
Torx-40 driver on a .” drive ratchet, you will have to exert
moderate to significant force on the ratchet to adequately secure
the injector into the head. During this process (of tightening the
hold down bolt) you are actually crushing the copper/stainless
steel crush washer against the injector cup inside the cylinder
head. You will begin to feel significant resistance PRIOR to the

injector actually being installed 100% completely! Do not be
concerned with over tightening this hold down bolt! The factory
torque specification for this fastener is 24lb ft. HOWEVER; we
strongly suggest that you exceed the factory torque specification.
The single biggest mistake while installing injectors is not
having the injector fully seated, and failing to fully tighten
the hold-down bolts. IF the crush washer is NOT fully “crushed”
then you will be re-doing this entire process in a few weeks time.
You cannot damage the injector by over-tightening the bolts, but
you can seriously damage both the injector and the engine if the
injector is not securely bolted down because raw fuel will leak
into the cylinder.
When we are doing the installation, we torque the injector down
as described above, then gently tap the metal (top) portion of the
injector with a clean brass hammer, and triple check the hold
down bolts, to ensure that we can’t
get another quarter turn with
the ratchet.
Repeat this process for the remaining 7 injectors, and then
recheck the hold down bolts.
Once all injectors are installed, and all 8 of the hold down bolts
are tight, you may now install each injectorʼs round wiring harness
into the hole in the cast aluminum spacer on the head. You may
have to rotate the injector connector within the aluminum head
spacer to get the tab & notch to align properly. Also, ensure that
the harness from each injector will adequately clear any moving
parts, such as the rocker arms.
Next is the installation of the oil rail.
Injectors-Chips-Clutches-Transmissions-Turbos-Engines-Fuel Systems
www.swampsdiesel.com
On the 2003-2004 engines with the log style oil rail, gently set the
(clean) rail onto the top of the injectors, ensuring that the nipples
(on the bottom of the rail) are allowed to mate properly with the
hole (oil inlet) in the top of each injector, as well as line up with
the (9) bolt holes which will secure the oil rail to the cylinder head.
Take precaution that the nipples are not being driven into the
electrical solenoids on the sides of the injectors…make sure the
nipples are seating properly into the oil inlet hole in the top of
each injector.
Start all (9) bolts by hand, prior to tightening any of them. These
(9) 8mm bolts which secure this rail to the head, are threading
into an aluminum portion (spacer) on the head, so do not over
tighten these (9) bolts. Double-check them to ensure that they are
tightened. Also reinstall the large 24mm o-ring fitting from the
braided stainless steel oil feed line onto the cast iron rail.
On the 2004.5-2007 engines, with the web style oil rail, gently set
the (clean) rail onto the top of the injectors, ensuring that the feed
tube mates properly with the bottom of the oil rail, & that the
nipples (on the bottom of the rail) are allowed to mate properly
with the hole (oil inlet) in the top of each injector, as well as line
up with the (9) bolt holes which will secure the oil rail to the
cylinder head. Take precaution that the nipples are not being
driven into the electrical solenoids on the sides of the
injectors…make sure the nipples are seating properly into the oil
inlet hole in the top of each injector.
Start all (9) Torx-30 bolts by hand, prior to tightening any of them.
These (9) 8mm bolts which secure this rail to the head, are

threading into an aluminum portion (spacer) on the head, so do
not over tighten these (9) bolts. Double-check them to ensure that
they are tightened.
Now you are ready to reinstall the valve covers, FICM & Glow
Plug controller, double check any wiring connections, secure the
coolant reservoir, as well as reinstall the intercooler pipe & air
filter components.
The valve cover bolts are also threading into the cast aluminum
head spacer, so take care in not over torqueing the bolts, which
secure the valve, cover to the head.
Prior to starting the engine:
Turn the key to the “on” position (do not crank), which will allow
the electric fuel pump to refill the fuel passages in the cylinder
head with fuel. Repeat the ʻkey onʼ procedure 3-4 times, with 15
seconds between key cycles.
I
f you are unsure as to whether or not you have weak batteries or
a weak starter…you are about to find out! : D
I
t typically takes us 6 or so cranking cycles (20 seconds
continuous with 2 minutes cool down time) to get the engine to
build enough high-pressure oil to mechanically fire the injectors. If
your batteries are weak, you may need to hook up a battery
charger, or (worse-case) use jumper cables connected to another
vehicle.

Once the engine fires, it is completely normal to have excessive
amounts of white smoke exiting the exhaust pipe. This is from the
small amount of fuel that was allowed into the cylinders during the

injector swap. It is also completely normal for the engine to run
rough for up to 20 miles after starting. This is caused from large
amounts of air that have been introduced into both the fuel & highpressure
oil systems. Extended idle time will not purge these
systems of the air. You will need to drive the truck for 20
miles minimum.
I

Back to top Go down
http://busmaintenance.forumshome.com
rbannerman



Posts : 3
Join date : 2016-04-07

PostSubject: Re: VT365 Torque Spec for Injectors   Thu Apr 07, 2016 10:21 am

Nice I like this
Back to top Go down
 
VT365 Torque Spec for Injectors
View previous topic View next topic Back to top 
Page 1 of 1

Permissions in this forum:You cannot reply to topics in this forum
BusMaintenance :: Bus Maintenance :: Procedures-
Jump to: