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SERVICE BULLETINNUMBER ST-09-10/82 |
Issued 10/18/82
CATEGORY: TECHNICAL
ATTN: ALL DMC DEALERS/SERVICE MANAGERS
SUBJECT: ENGINE COOLING SYSTEM BLEEDING
Because the De Lorean is equipped with an aluminum engine, it
is extremely important that the engine's cooling system be
absolutely free of any air. If the cooling system is opened
for service or any other reason or after a leak has been
repaired THE SYSTEM MUST BE BLED.
Bleeding Procedure:
1) Fill the coolant reservoir tank with fresh 50/50 coolant
mixture.
NOTE: The coolant level must not fall below the
minimum (MIN) level indicated on the reservoir
tank during the bleeding procedure to avoid
air from being drawn into the system.
2) Attach a suitable length of hose to the bleed screw
located on the thermostat housing. Route this hose
clear of all belts and pulleys and place the other end
into a container holding coolant mixture. The hose
must remain in the coolant during the bleeding.
3) Start and run the engine until normal operating temp-
erature is reached.
Thermostat starts to open at 185°F
Thermostat full open at 212°F
4) While running the engine between 1500-2000 RPM, open
the bleed screw to allow the trapped air to escape.
Close the bleed screw. Because of the low pressures
and remote location of the radiator in this system,
this step must be repeated until all air pockets are
removed.
Continued . . .
Reimbursement Due to the special attention required, we are increasing the time allowance for this procedure. Oper. No. Description New Time Allowance 13101 Pressure & Leakage Test .7 hr 13102 Drain & Refill Cooling System .8 hr (includes #13101) 13103 Remove & Replace Radiator 2.5 hr (includes #13102) 13104 Remove & Replace Hose, Coolant .9 hr (includes #13102) Please inform all personnel accordingly. John J. Patro Technical Publications Manager JJP:slb