4.0 O.H.V. Machining and Rebuilding Specs and links

[KevinSonOfDad]

*articles and machine shops will be updated as people give me info of other sources and shops near them*
Articles and Resources for Rebuild
The Ranger Station Performance Build Article
Engine Builder Mag Article on the History and Differences Between 4.0l Parts Over the Years

Machine Shops
Jensen Auto Service - Ogden, Utah

SPECS
*All measurements in inches*
Cylinder Head
Minimum Thickness:
2.8800"

Warp Spec:
0.006" OVERALL

Chamber Volume:
1990-1994: 60 CC'S 1995-2000: 48 CC'S (note: 98tm castings have smaller exhaust ports) Marnel 43 CC'S

Lifter Bore Diameter:
0.8742-0.8755"

Valves
Intake Valve Lash:
0.090-0.170" DRY

Exhaust Valve Lash:
0.090-0.170" DRY

Installed Stem Height:
1.7350-1.7450"

Stem Diameter:
Intake: 0.3159-0.3167" Exhaust: 0.3149-0.3156"

Head Diameter:
Intake: 1.710" Exhaust: 1.358"

Angle:
44°

Margin:
0.0310"

Guide Height:
0.650-0.660"

Guide Clearance:
Intake: 0.0008-0.0025" Exhaust: 0.0018-0.0035"

Seat Width:
0.060-0.079"

Seat Angle:
45°

Valve Springs
Free Length:
2.140"

Installed Height:
1.578-1.609"

Open Test Pressure:
162-175 LBS @ 1.180"

Close Test Pressure:
76-86 LBS @ 1.585"

Cylinder Block
Bore Diameter:
3.9527-3.9543"

Deck Height (Measured from main to deck):
8.8580"

Bore Center to Center
4.760"

Lifter Bore Diameter Oil Clearance:
0.0005-0.0022"


Crankshaft
Stroke:
3.325"

Cylinder Bore:
3.9527-3.9543"

Rod Journal
Rod Journal Diameter:
2.1252-2.1260"

Journal Width:
0.8220"

Oil Clearance (Rod Journal):
0.0005-0.0024"

Main Journal
Position 1-6:
2.2433-2.2441"

Oil Clearance (Main Journal):
0.0005-0.0019"

End Play:
0.0020-0.0125"

Thrust Width:
1.0390-1.0410"

Rear Seal Diameter:
2.3760"

Pulley Diameter:
1.1025"

Gear Diameter:
1.1025"


Connecting Rod
Big End Housing Bore:
2.2370-2.2378"

Big End Width:
0.9930"

Big End Side Clearance:
0.0002-0.0025"

Bolt Diameter:
0.315"

Small End Bore For Bushing:
0.9432-0.9439"

Small End Bore Finished Inside Diameter:
0.9432-0.9439"

Center To Center Distance:
5.748"

Twist/Bend:
Maximum 0.002/0.0006"

Service Limit:
0.014"


Camshaft
Lobe Lift:
Intake and Exhaust: 0.4024

Journal Diameters:
1. 1.9516-1.9524"
2. 1.9374-1.9382"
3. 1.9224-1.9232"
4. 1.9071-1.9079"

Journal Oil Clearance:
0.0010-0.0026

Camshaft End Play:
0.0008-0.004"

Lifter Diameter:
0.8742-0.8755"


Torque Specs
Intake Manifold:
Torque in steps 8,13,18 FT/LBS

Exhaust Manifold:
19 FT/LBS

Flywheel:
55-59 FT/LBS FLY, 20-34 FT/LBS FLEX
Flywheel surfacing: flat

Damper:
30-37 FT/LBS + 80°-90°

Main Bearing Cap:
66-77 FT/LBS

Connecting Rod:
18-24 FT/LBS

Cylinder Head:
44, 55 FT/LBS + 80°-85°

Camshaft Gear Bolt:
44-50 FT/LBS

 

[KevinSonOfDad]

Getting everything entered now. if anyone has questions about anything feel free to ask

 

[KevinSonOfDad]

Should be all set feel free to add a comment with any questions you have as well as any machine shops near you so i can update the list to be most helpful

 

[alwaysFlOoReD]

What is Marnel?
"Chamber Volume:
1990-1994: 60 CC'S 1995-2000: 48 CC'S (note: 98tm castings have smaller exhaust ports) Marnel 43 CC'S"

Isn't the bore rather small?
"Lifter Bore Diameter:
0.0005-0.0022"

Are they supposed to be the same?
"Small End Bore For Bushing:
0.9432-0.9439"
"Small End Bore Finished Inside Diameter:
0.9432-0.9439"

 

[KevinSonOfDad]

What is Marnel?
"Chamber Volume:
1990-1994: 60 CC'S 1995-2000: 48 CC'S (note: 98tm castings have smaller exhaust ports) Marnel 43 CC'S"

Isn't the bore rather small?
"Lifter Bore Diameter:
0.0005-0.0022"

Are they supposed to be the same?
"Small End Bore For Bushing:
0.9432-0.9439"
"Small End Bore Finished Inside Diameter:
0.9432-0.9439"

marnel is a company that makes aftermarket heads or at least used to

that would be the oil clearance for the lifter bore let me change that

thats how they are listed on our specs i assume one is with a bushing the other without idk