PS Magazine - TB 43-PS-604
PS, The Preventative Maintenance Monthly
ISSUE 604
MARCH 2003
PS 604
MAR 03
2
M1-Series Tanks…
A
small leak from your tank’s exhaust grille door seal can do a lot of damage. A
torn, crushed or brittle seal lets hot exhaust cook the engine and transmission oil
coolers and oil cooler crossover hose.
That heat can cost you an engine or transmission as the overheated oil breaks
down and moving parts don’t get lubricated.
Even worse, the heat makes the oil
cooler crossover hose brittle. If it
cracks open and leaks oil onto the hot
exhaust manifold.
.. well, that’s a fire in
the making.
If you spot a bad seal, replace it
using new mounting screws. Those old
screws have been through a lot of heat
and will snap if you try to reuse ‘em.
Some tanks use seal, NSN 5330-01-099-6331, that’s held in place with 18 screws,
NSN 5306-01-309-7031. Other tanks take seal, NSN 5330-01-320-3692, that’s
mounted with six screws, NSN 5305-00-988-7794. Check the old seal to make sure
you order the right replacement.
Coat the threads of the new screws with antiseize compound, NSN 8030-00-597-
5367. Then torque ‘em to 120-130 lb-in. They’ll come out much easier next time.
Next, scan the oil cooler
crossover hose for cracks and
wear. If the hose is damaged,
replace it with NSN 4720-01-
067-9039.
Secure the hose so it doesn’t
touch the exhaust duct or the
top deck. If the hose touches,
it’ll burn, so loosen the mount-
ing bolts and reposition it.
Torque the bolts to 46-68 lb-ft.
Start the engine and check
where the hose clamps to the
oil coolers. If you see any
leakage, the O-rings could be
bad. Replace ‘em with NSN
Look for damage
to seal
Check crossover hose for cracks and wear
Leaks here? Replace O-rings
I don’t
need you
around
here!
go
on!
get
lost!
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