Torque Specs
Ford Barra torque specs and bolt lengths and information
Ford Barra Workshop Manual
Courtesy of fordforums.com.au here is the workshop manual section focused on the BA version of the Barra. Most information is relevant to BF and FG motors.
What's the torque for?
Cylinder
Head Stud – 12.0mm
100 with Moly
135 NM with
Moly
Cylinder
Head Stud – 14.3mm
135-140 with
Moly
187-190 NM with
Moly
Camshaft
Caps Saddles
10 with Loctite
222
13 NM with
Loctite 222
Main cap
bolts – without girdle
65 with Oil
88 NM with Oil
Main cap
bolts – with girdle
75 with Oil
100 NM with Oil
Main cap
studs – with girdle
75 with Oil
100 NM with Oil
STEEL Main
caps - studs & girdle
100 with oil
135 NM with oil
Camshaft
sprocket bolts – M10
55 with Loctite
222
72 Nm with
Loctite 222
Camshaft
sprocket bolts – M6
13 with Loctite
222
17 NM with
Loctite 222
Camshaft
sprocket bolts – M8
23 with Loctite
222
31 NM with
Loctite 222
Steel
conrods – ARP 3/8” bolts (Atomic rods <2023)
55 with Moly
72 NM with Moly
Steel
conrods – CA625 3/8” bolts (2023 onwards)
60 with Moly
87 NM with Moly
Steel
conrods – ARP 7/16” bolts
65 with Moly
87 NM with Moly
Alloy
conrods – Carrillo 7/16” bolts
100 in a single
movement with oil on threads
134 NM in a
single movement with oiled threads
Harmonic
balancer retaining bolt
100 with
Silicone 250 on washer and keyway, moly on thread
then Loctite 222
135 NM with
Silicone 250 on washer and keyway, moly on
thread, then Loctite 222
Sump cross
bolts – M10
50 with Loctite
222
67 NM with
Loctite 222
Sump to block bolts - M6
10 with Loctite 222
13 NM with
Loctite 222
Timing pivot
bolt – M18
19 with Loctite
222
25 NM with
Loctite 222
D/Side pivot
bolt - M8 flange nut
20 with Loctite
222
27 NM with
Loctite 222
Oil pump
pickup support brace – M8 crimp nut
15 with Loctite
222
20 NM with
Loctite 222
Oil pump to
block bolts
12 with Loctite
222
16 NM with
Loctite 222
Oil pump
backing plate bolts
10 with Loctite
222
13 NM with
Loctite 222
Oil pump
pressure relief valve
33 with Loctite
222
45 NM with
Loctite 222
Flywheel/flexplate
bolts
70 with Moly
under heads and Loctite 262 on threads
100 NM with
Moly under heads and Loctite 262 on threads
Bearing Clearance Suggestions
All clearances are general suggestions and must be tailored to suit your parts, power goals, intended use, oil, quality of parts etc. Atomic is trying to share some information to those who need a starting point and is not responsible for any issues arising from the use of this information. If you are unsure please contact a professional engine builder for guidance.
Item | Desired clearance in inches
Conrod bearing – steel conrod .002” - .0022”
Conrod bearing – alloy conrod .002”
Conrod side clearance – steel conrod .008” minimum
Conrod side clearance – alloy conrod .018” minimum
Conrod small end – steel conrod .0005”
Conrod small end – alloy conrod .001”
Main bearings – vertical bearing clearance .003” - .0035”
Thrust – 180 or 360 degree .004” - .006”
Thrust – Torrington .004” - .005”
Piston rings – Top ring Steel .024“ minimum
Piston rings – Second Iron .022” minimum
Piston rings – Oil expander .005” maximum
Piston rings – Oil rails .018” minimum
Piston deck height variation – minimum .005”
Piston to bore clearance – Cast pistons NO grout .002” minimum
Piston to bore clearance – Forged pistons NO grout .0045” minimum
Piston to bore clearance – Forged pistons WITH grout .0055” minimum
Piston to valve clearance .060” minimum
Valvespring retainer to valvestem clearance .060” minimum
Lifter preload – hydraulic .020” minimum, .050" maximum
Tappet clearance – solids Refer cam manufacturers spec
