Astro Van M L4-151 2.5L (1985)
Technical Service Bulletin # 873066A
Date: 890701
Engine - Coolant Loss
Number:
87-306-6A
Section:
6A
Date:
July 1989
Subject:
BROKEN CYLINDER HEAD BOLT/COOLANT LOSS
Model and Year:
1985-87 A, F, X CARS AND S,T TRUCKS AND M VANS WITH 2.5L ENGINE (VIN CODE R, 2, E)
TO:
ALL CHEVROLET DEALERS
The following passenger cars, trucks, and vans equipped with the 2.5L engine may experience coolant loss due to broken cylinder head bolts:
1985-87 A-cars with 2.5L engine (VIN Code R) 1985-86 F-cars with 2.5L engine (VIN Code 2) 1985 X-cars with 2.5L engine (VIN Code R) 1985-87
S/T-trucks and M-vans with 2.5L engine (VIN Code E)
FIGURE 1
The head bolts most susceptible to this condition are the center three located closest to the exhaust manifold, i.e. bolts # 2, # 3, and # 6, see FIGURE 1.
If one of these three bolts is broken, replace all 3 bolts with new ones per the Application Table.
Major tools required:
Reversible electric drill
J-24460 and J-23699
Coolant System Pressure Tester
J-36660
