Torque specifications

Tiny
TOFFEE
  • MEMBER
  • 2005 MAZDA 3
  • 150,000 MILES
Want to know torque specifications of main bearings and big-ends for LF engine.
Wednesday, August 14th, 2019 AT 3:00 AM

14 Replies

Tiny
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Good morning,

I posted the information below for you.

Roy

Main bearings

Main bearing

Main bearing size

STD:. 2.506-2.509 mm (0.0987-0.0988 in)
OSO.25:. 2.628-2.634 mm (0.1034-0.1037 in)

Main Bearing Cap Assembly Note

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1. Install the main bearing caps in the order indicated in the figure.
2. Tighten the main bearing cap bolts using the SST (49 D032 316).

Tightening torque

Plastic region tightening bolt
(Bolt stem length 110 mm)

Standard:. 110.0-110.6 (4.33-4.35)
Maximum:. 111.3 (4.38)

(1). 44 46 N-m (4.5-4.6 kgf-m, 32.5-33.9 ft-lbt)
(2). 175°-185°

Elastic region tightening bolt
(Bolt stem length 104 mm)

(1) Apply engine oil to all bolts.
(2). 3-7 N-m (30.6-71.3 kgf-cm, 26.6-61.9 in-lbt)
(3). 23-27 N-m (2.4-2.7 kgf-m, 17-19.9 ft-lbt)
(4). 38-42 N-m (3.9-4.2 kgf-m, 28.1-30.9 ft-lbt)
(5) Loosen all the bolts. (No remaining torque.)
(6). 3-7 N-m (30.6-71.3 kgf-cm, 26.6-61.9 in-lbt)
(7). 18-22 N-m (1.9-2.2 kgf-m, 13.3-16.2 ft-lbt)
(8). 87.5°-92.5°

Crankshaft

Crankshaft end play (Standard). 0.22-0.45 mm (0.0087-0.0177 in)
Crankshaft end play (Maximum). 0.55 mm (0.0216 in)
Crankshaft runout (Maximum). H 0.05 mm (0.0019 in)

Main journal bearing size

STD:. 51.980-52.000 mm (2.0464-2.0472 in)
USO.25:. 51.730-51.750 mm (2.0366-2.0373 in)

Main journal out of round

(Maximum). 0.05 mm (0.0019 in)

Crank pin journal diameter [LF]

STD:. 46.980-47.000 mm (1.8497-1.8503 in)
USO.25:. 46.730-46.750 mm (1.8398-1.8405 in)

Crank pin journal diameter [L3]

STD:. 49.980-50.000 mm (1.9677-1.9685 in)
USO.25:. 49.730-49.750 mm (1.9579-1.9586 in)

Crank pin out of round

(Maximum). (0.05 mm (0.0019 in)

Main journal oil clearance

(Standard). 0.019-0.035 mm (0.0007-0.0013 in)
(Maximum). 0.10 mm (0.0039 in)

Crankshaft Pulley

Tighten the crankshaft pulley lock bolt in the order shown following two steps using the SST (49 D032 316).

(1) Tighten. 96-104 N-m (9.8-10.6 kgf-m, 70.9-76.7 ft-lbf)
(2) Tighten. 87°-93°

Rod bearings

Connecting Rod

Connecting rod side clearance

(Standard). 0.14-0.36 mm (0.0056-0.0141 in)
(Maximum). 0.435 mm (0.0172 in)

Connecting rod bolt Length

Standard:. 44.7-45.3 (1.75-1.781
Maximum:. 46.0 (1.81)

Connecting rod bearing oil clearance

(Standard). 0.026-0.052 mm (0.0011-0.0020 In)
(Maximum). 0.1 mm (0.0039 in)

Connecting rod bearing size [LF]

STD:. 1.498-1.504 mm (0.0589--0.0592 In)
OSO.25:. 1.623-1.629 mm (0.0639-0.0641 In)

Connecting rod bearing size [L3]

STD:. 1.496-1.502 mm (0.0589-0.0591 in)
OSO.25:. 1.621-1.627 mm (0.0639-0.0641 in)

Connecting Rod Cap Bolts

Tighten the connecting rod bolts in two steps using the SST (49 D032 316).

(1). 26-32 N-m (2.7-3.2 kgf-m, 19.2-23.6 ft-lbf)
(2). 80°-100°
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Wednesday, August 14th, 2019 AT 4:52 AM
Tiny
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Thanks so much.
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Wednesday, August 14th, 2019 AT 4:57 AM
Tiny
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Another question is, how do you set timing, it uses chain + twin cams?
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Wednesday, August 14th, 2019 AT 5:05 AM
Tiny
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Do you mean setting the timing chains?

Roy
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Wednesday, August 14th, 2019 AT 6:46 AM
Tiny
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Yes.
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Wednesday, August 14th, 2019 AT 6:51 AM
Tiny
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Okay, you need 2 special tools for this.

One is to lock the engine at top dead center and the other is to lock the cams at the same.

Roy
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Wednesday, August 14th, 2019 AT 9:30 AM
Tiny
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Hi, having a problem with Mazda3 engine. It was turning when on the ground but after installing, it only turns half way and stuck.
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Sunday, August 18th, 2019 AT 8:27 AM
Tiny
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Double-check your valve timing. It may be hitting a piston.

Did you verify the chain alignment?

Roy
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Sunday, August 18th, 2019 AT 11:38 AM
Tiny
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Yes, I did verified chain alignment.
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Sunday, August 18th, 2019 AT 11:07 PM
Tiny
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The car is an auto.
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Sunday, August 18th, 2019 AT 11:07 PM
Tiny
TOFFEE
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Flywheel is sticking, it turns but somewhere it sticks.
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Sunday, August 18th, 2019 AT 11:14 PM
Tiny
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If you remove the plugs and you hand turn the engine does it still stop?

Roy
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Monday, August 19th, 2019 AT 2:10 AM
Tiny
TOFFEE
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Car cranking but not starting (2005 Mazda 3 auto).
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Wednesday, August 28th, 2019 AT 3:03 AM
Tiny
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Perform a compression test.

https://www.2carpros.com/articles/how-to-test-engine-compression

Roy
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Wednesday, August 28th, 2019 AT 3:18 AM

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