Main caps tq specs. Engine builders come in here!

1987stangman said:

I am doing a basic engine rebuild on my 87' GT, bearing and rings, etc. I am installing the crank today and I am using the Haynes book to guide me because it is my first total engine overhaul. The book gives a 60-70 FT LBS main cap torque spec but it says to torque the thrust bearing cap to 10-12 FT LBS. Is this right? I know it is the trust bearing and all but it makes more sense to use the same torque specs on all main caps.

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NOTE: Before assembling cylinder block (6010) , all sealing surfaces must be clean and free of chips, dirt, paint and foreign material. Also ensure coolant and oil passages are clear.

NOTE: If new piston rings are to be installed and no visible cross-hatch marks remain on the cylinder wall, remove cylinder wall glaze using a spring-type tool. Follow instructions of tool manufacturer.

NOTE: Lightly oil all retaining bolt and stud threads before installation, except those specifying special sealant.

Place upper crankshaft main bearings in position in the bores with the tang fitting in the slot provided. Lubricate crankshaft main bearings with Engine Assembly Lubricant D9AZ-19579-D or equivalent meeting Ford specification ESR-M99C80-A.
Install the lower crankshaft main bearings in the crankshaft main bearing caps.
Carefully lower crankshaft into place. Use care to prevent damage to bearing surfaces.
Check clearance of each crankshaft main bearing following the procedure under Fitting Main and Connecting Rod Bearings in Section 03-00.
After bearings have been fitted, apply a light coat of Engine Assembly Lubricant D9AZ-19579-D or equivalent meeting Ford specification ESR-M99C80-A to the journals and bearings.
CAUTION: Ensure main bearing caps are installed in their original position or damage to engine may occur.

Install all crankshaft main bearings and caps except thrust bearing cap (No. 3 crankshaft thrust main bearing (6337) ). Tighten main bearing caps to 81-95 Nm (60-70 lb-ft).
NOTE: Apply sealer Silicone Rubber D6AZ-19562-AA or BA or equivalent meeting Ford specification ESB-M4G92-A and ESE-M4G195-A in a 1.59 mm (1/16 inch) bead in each corner of rear main bearing cap saddle and full length of the saddle.

Install thrust main bearing cap (No. 3) with bolts finger-tight.

Crankshaft





Item Part Number Description
1 388813 Bolt 5/8-18
2 6378 Damper Washer
3 6312 Crankshaft Pulley
4 6316 Crankshaft Damper
5 6306 Crankshaft Sprocket
6 388907 Crankshaft Key
7 6303 Crankshaft
8 6333 Upper Crankshaft Main Bearing
9 6337 Upper Crankshaft Thrust Main Bearing
10 6375 Flywheel
11 6701 Crankshaft Rear Oil Seal
12 6333 Lower Crankshaft Main Bearing
13 6337 Lower Crankshaft Thrust Main Bearing
14 — Main Bearing Rear Cap (Part of 6010)
15 — Main Bearing Rear Intermediate Cap (Part of 6010)
16 — Main Bearing Center Cap (Part of 6010)
17 — Main Bearing Front Intermediate Cap (Part of 6010)
18 — Main Bearing Front Cap (Part of 6010)
19 391546 Main Bearing Cap Stud
20 391547 Main Bearing Cap Bolt (9 Req'd)
21 N804586-S2 Bolt (4 Req'd)

Pry crankshaft forward against thrust surface of upper crankshaft thrust main bearing .
Hold crankshaft forward and pry main thrust bearing cap to the rear. This will align thrust surfaces of both halves of crankshaft thrust main bearing.
Retain forward pressure on crankshaft . Tighten cap bolts to 81-95 Nm (60-70 lb-ft).
Pry crankshaft toward the rear of engine.

Crankshaft Thrust Bearing Alignment





Check crankshaft end play. Refer to Section 03-00.
Install crankshaft rear oil seal as outlined. Install engine rear plate and flywheel . Tighten bolts to 102-115 Nm (75-85 lb-ft).
Coat all camshaft bearings (6261) , camshaft lobes and gear with Engine Assembly Lubricant D9AZ-19579-D or equivalent meeting Ford specification ESR-M99C80-A.
Carefully slide camshaft through camshaft bearings . Install camshaft thrust plate with groove toward cylinder block . Tighten thrust plate retaining bolts to 12-16 Nm (9-12 lb-ft).


lifted right from the ford shop manual