Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1985S10/T10 BLAZER 4WD L4-151 2.5LREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER HEAD ASSEMBLYSYSTEM SPECIFICATIONSTORQUE SPECIFICATIONS
1985 Chevrolet S10/T10 Blazer 4WD L4-151 2.5L
Torque Specifications
1985 Chevrolet S10/T10 Blazer 4WD L4-151 2.5LSECTION Torque Specifications
86chevy12
Number: 86-2 REISSUE
Section: 6
Date: Sept. 1986
Subject NEW BOLT TIGHTENING PROCEDURE
FOR 2.5L CYLINDER HEAD
Model and Year: 1985 AND 1986 CELEBRITY, CAMARO, CITATION, S/T TRUCKS AND ASTRO VANS (VIN CODES E, R, 2)
TO: ALL CHEVROLET DEALERS
This supercedes all previous 1986 publications dealing with tightening 2.5L cylinder head bolts and cancels previously issued Dealer service Bulletin 86-2 dated October, 1985 of which all copies should be destroyed.
A new bolt tightening procedure has been developed for the 2.5L engine which improves head to block clamping force and assures more uniform tightening.
The procedure to be used is as follows:
1. Cylinder head bolts should be washed in solvent and dried prior to installation. All residual oil should be wiped from the cylinder head mating surface.
2. Apply a light coat of engine oil to the threads and the underside of the bolt head of bolts # 1 thru # 8.
3. Apply sealing compound P/N 1052080 to threads of bolts # 9 and # 10.
4. Install all cylinder head bolts and torque on 25 Nm (18 ft.lbs.) in specified sequence (see illustration).
5. Repeat the sequence bringing torque to 30 Nm (22 ft. lbs.) on all bolts except # 9. Torque # 9 to 40 Nm (30 ft.lbs.).
6. Repeating the sequence, rotate all bolts except # 9, 120 degrees (two (2) flats).
7. # 9 bolt should be rotated 90 degrees (1/4 turn).
Number: 86-2 REISSUE
Section: 6
Date: Sept. 1986
Subject NEW BOLT TIGHTENING PROCEDURE
FOR 2.5L CYLINDER HEAD
Model and Year: 1985 AND 1986 CELEBRITY, CAMARO, CITATION, S/T TRUCKS AND ASTRO VANS (VIN CODES E, R, 2)
TO: ALL CHEVROLET DEALERS
This supercedes all previous 1986 publications dealing with tightening 2.5L cylinder head bolts and cancels previously issued Dealer service Bulletin 86-2 dated October, 1985 of which all copies should be destroyed.
A new bolt tightening procedure has been developed for the 2.5L engine which improves head to block clamping force and assures more uniform tightening.
NUMBERS SHOWN DESIGNATE BOLT POSITIONS AND BOLT TIGHTENING SEQUENCE:
The procedure to be used is as follows:
1. Cylinder head bolts should be washed in solvent and dried prior to installation. All residual oil should be wiped from the cylinder head mating surface.
2. Apply a light coat of engine oil to the threads and the underside of the bolt head of bolts # 1 thru # 8.
3. Apply sealing compound P/N 1052080 to threads of bolts # 9 and # 10.
4. Install all cylinder head bolts and torque on 25 Nm (18 ft.lbs.) in specified sequence (see illustration).
5. Repeat the sequence bringing torque to 30 Nm (22 ft. lbs.) on all bolts except # 9. Torque # 9 to 40 Nm (30 ft.lbs.).
6. Repeating the sequence, rotate all bolts except # 9, 120 degrees (two (2) flats).
7. # 9 bolt should be rotated 90 degrees (1/4 turn).
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.