Tomei Powered RB26DETT HEAD STUD BOLTS - Manual (Page 7)

7
INSTALLATION
CAUTION
■ Depending on the condition of the engine, to guarantee the bolts effective clamping force,
it's required to bore the Cylinder Block with the use of a Dummy Head.
This ensures the correct clamping force is obtained with the screw threads.
Any block distortions will be corrected. When the bolts are exchanged, it is highly
recommended to bore the block with a dummy head again, even if this had been done before.
As is with the correct size, you When the head is bolted onto the Boring with a Dummy Head
can confirm the correct clearance. Cylinder. The cylinder will distort, will correct the distortions.
clearances will then change. The It will also confirm the correct
distortion amount will be different perfect clearances.
between the stock head bolts &
that of the Tomei Head Studs. So
you'll need to bore the cylinder.
The cylinder is squarely
bored straight to 0.5mm
oversized with a Dummy
Head attached. To remove
any Cylinder Bore distortions.
■ It's not possible to remove the Stud Bolts when the Camshafts are installed.
(The Camshafts will have to be removed in order to detach the Cylinder Head)
ASSEMBLY CONFIGURATION
● This illustration shows how the
product is assembled. The
Camshafts will have to be
removed before the Stud Bolt
can be removed.
CYLINDER HEAD INSTALLED STATE DUMMY HEAD BORING
D+0.020
D
Piston Movement
Cylinder
D +0.040 -0.010
D
+0.040
-0.010
Excessive
clearance
(Blowby)
Clearance is
too small
(D+0.5)+0.020
(D+0.5)
NUT (x14)
STUS BOLT (x14)
M6 BOLT
(Stock)
WASHER
(Stock)
M6 BOLT (Stock)
M6 BOLT (Stock)