DETROIT DIESEL 53
Specifications 1.0
TROUBLE SHOOTING
SUGGESTED REMEDY
7.
Black carbon deposits extending from the valve
1.
Check for carbon deposits, bent guide, defective
seat to the guide indicate cold operation due to light
spring or antifreeze (glycol) in the lubricating oil.
loads or the use of low volatility fuel. Rusty brown valve
Replace a bent guide. Clean-up and reface the valve.
head with carbon deposits forming narrow collars near
Replace the valve if necessary.
guide indicate hot operation due to overloads,
inadequate cooling or improper timing which results in
2.
Check for excessive valve-to-guide clearance,
carbonization of lubricating oil. Clean-up valves, guides
bent guide or carbon deposits. Replace a bent or worn
and inserts. Reface valves and inserts; replace if
guide. Clean the carbon from the valve. Reface or
warped, pitted or scored.
replace the valve, if necessary.
8.
Check for worn guides or excessive exhaust
3.
Check the operating conditions such as engine
back pressure. Replace worn guides. Check valve seat
overload, inadequate cooling or improper timing.
for improper seating. Reface the valve and insert or, if
Reface the valve and insert. Replace the valve if
necessary, replace.
warped or too badly pitted. Use a harder-face valve if
operating conditions warrant.
9.
Check for bent valve stem or guide, metal chips
or dirt or for lack of lubrication. Clean up valve stem
4.
Check for contact between the valve head and
with crocus cloth wet with fuel oil or replace the valve.
the piston as a result of incorrect valve lash, exhaust
Replace the guide. When installing the valve, use care
valve bridge improperly positioned or a defective spring.
in depressing the spring so spring cap DOES NOT
Check the valve guide, insert, cylinder head and
scrape the valve stem.
piston for damage. Replace damaged parts.
10.
Check the gear train timing or for gear train
5.
Check for excessive valve-to-guide clearance,
failure.
defective spring or etching of the valve stem at the
weld. Improper valve lash is also a cause of this type
11.
Check the operation of the engine for excessive
failure. Check the guide, insert, cylinder head and
idling and resultant low engine exhaust back pressure.
piston for damage. Replace damaged parts.
Install valve guide oil seals.
6.
Replace worn valve guide. Check and replace
the valve, if necessary.
1972 General Motors Corp.
February, 1972
SEC. 1.0 Page 3
