need advice on rocker arm installation

[macr6]

Hey guys,

I had to replace the headgasket on my 98 3.0l mercruiser. I got piston #1 to TDC. removed the rockers and rods and replaced the gasket. Now I'm putting the rockers and rods back on and the book says to torque them down to 20lb ft. If I do that however, they look like they are lower than when I started. My seloc manual just says to remove lash play then 3/4 more turn. The service manual online at boatfix says that the lash play will be removed when you torque them down right.

Should I just torque them to 20lb ft since I am reinstalling them or should I just remove the lash play and another 3/4 turn?

Thaks

 

[macr6]

Re: need advice on rocker arm installation

Also, to get the motor to TDC for #1 i used the key and did little starts to get the pulley around. That was before I took anything apart. If I have to move the timing around again how do i move the pistons?

 

[Haut Medoc]

Re: need advice on rocker arm installation

If you did not turn the engine without the dist being removed, you needn't worry.....
What book says 20#?...
I'd be more inclined to believe the Seloc in this case.....
Don S just posted this, it should work for you.....

Engine Not Running
With valve cover removed, adjust valves when lifter
is on low part of camshaft lobe, as follows:
1. Crank engine with starter or turn over in normal
direction of rotation until mark on torsional damper
lines up with center “0” mark on timing tab, and
engine is in No. 1 firing position. This may be determined
by placing fingers on No. 1 valve as
mark. If valves move as mark comes up to timing
tab, engine is in No.4 firing position and should be
turned over one more time to reach No. 1 position.
No. 1 Cylinder - Exhaust and Intake
No. 2 Cylinder - Intake
No. 3 Cylinder - Exhaust
No. 4 Cylinder - Intake
2. With engine in No. 1 firing position as determined
above, the following valves may be adjusted:
3. Back out adjusting nut until lash is felt at push rod,
then turn in adjusting nut until all lash is removed.
This can be determined by moving push rod upand-
down while turning adjusting nut until all play
is removed.
4. Hydraulic lifters now can be adjusted by tightening
adjustment nut an additional 3/4-turn. Valve
lash should be checked after engine has run and
reached operating temperature.
5. Crank engine one revolution until pointer “0” mark
and torsional damper mark are again in alignment.
This is No. 4 firing position. With engine in
this position, the following valves may be adjusted:
No. 2 Cylinder - Exhaust
No. 3 Cylinder - Intake
No. 4 Cylinder - Exhaust
6. Install distributor cap, spark plug wires and coil
lead.
7. Install rocker arm cover; torque to 40 lb. in. (4.5
N?m).​

 

[Bt Doctur]

Re: need advice on rocker arm installation

never heard of torque on a chevy, always been 3/4 past "0" lash
0n a 302 ford the rockers are torqued.

 

[macr6]

Re: need advice on rocker arm installation

THanks for the help guys. I got it reinstalled just like you wrote with the 3/4 turn past 0 lash. I had 2 of them rattle a bit, but I fixed them and everything seems to be running smoothly.

 

[Don S]

Re: need advice on rocker arm installation

never heard of torque on a chevy, always been 3/4 past "0" lash
0n a 302 ford the rockers are torqued.

I won't say anything about the newer 7.4's and 4.3's ?