LAN my renewed engine M30B30 Running in process

[deQuincey]

Howdy.
This is the kind of things that i do best, providing useful hands-on documentation for people that love the emotion to have dirty hands and white smiles in their faces while taking care of their e9 coupes or e3 sedans

I take the information comming from the blue books, and bring my own experience to this, as always with some pics to clarify the evolution. Because as i said 14 years ago i think that wen you see that someone has done it you feel that you can do it too.

 

[deQuincey]

engine was completely redone and completed in March 2023.

while being on the engine stand i took advantage and made a valve gap adjustment

 

[deQuincey]

then it was prepared with anciliaries

finally placed in the car, and connected to surrounding systems

 

[deQuincey]

set static ingintion timing by means of a probe light

place 1st cyl in OT and check the front mark in the wheel balancer,

connect ignition, rotate the dizzy anti clockwise, and now slowly rotate the dizzy clockwise until light is on,

and gave life with a first start

then dynamic ignition setting with an strobo light to find the ball in window

and here it is the way I do it, an stroboscopic light is needed

finally the carburetor tuning and synchro is required,…in this case a gas tester for CO% is needed

.

 

[deQuincey]

we have covered 1000km following the running in procedures as found in the running in decal

time has come for a Head Bolts Retorque


i have used an old school head gasket from Goetze so retorque is the right thing to do now

 

[Ohmess]

I'm not seeing the pictures (and I like to follow your threads).

 

[deQuincey]

I'm not seeing the pictures (and I like to follow your threads).

I need time to complete, thank you for your patience, and for your support,

 

[deQuincey]

prepared some documentation for my own check and control of the process;

i plan to do a complete procedure:

- retorque head bolts
- valve gap adjustment
- ignition dynamic
- carbs synchro

i will share my own instructions

 

[deQuincey]

the process:

FIRST PART: HEAD BOLTS RETORQUE

so first thing is to go for a drive to warm up the engine,

then you have to prepare everything and wait for it to cool down until 35 cels

I left these red marks when I prepared the engine that was the three stages torque

now I add blue marks to remember starting position point for each bolt

check temperature

ready…

Now it is time to proceed with bolts retorque.

 

[deQuincey]

the sequence for the bolts is in the manual

I prepare the torque wrench with 70 N.m

the process must first set the bolt in a certain condition, as torque should be dynamic, not static, I mean if you apply torque to a bolt that is static you are getting a wrong result as bolt is stuck (fixed) in its position, you need to loosen that bolt only 1/8 of a turn in order to be able to apply proper torque

here it is the whole process…

the video ends checking the before and after position of the bolts in terms of turn angle, to my best understanding bolts number 10 (front) and 11 and 12 (rearmost position on the head) needed and additional 10º, rest of the bolts came to the same position.

here it is the proof:

bolt 10 = 10deg

bolt 11 = 10 deg

bolt 12 = 10 deg

with this operation head bolts are ok until next normal maintenance period.

 

[deQuincey]

now you need to wait for engine to cool down, and make the valve gap adjustment



SECOND PART: VALVE GAP ADJUSTMENT

 

[deQuincey]

and so we are in there now...

open the box, and find the things that were supposedly to be there, what is good...

using the tool to rotate the camshaft to place the cylinders at their TDC one at a time (thanks to @halboyles )

the tools...

and the plan, ...finally i decided to change the gauge from 0,20mm to 0,25mm (placed at the camshaft lobe / against the rocker pad)

engine must be rotated clockwise (looking at it from the front)

the 0,25mm gauge

and the process: slacken the nut...

place the gauge

put everything in contact by means of the bent tool

tightening the nut while keeping the pressure

finally applying 10N.m torque to the nut, using the right wrench

and final check of the gap at the valve this time, such as 0,25 pass freely, and 0,30 can´t
check all the cylinders both valves.

..

 

[deQuincey]

THIRD PART: SET IGNITION TIMING, DYNAMIC

 

[deQuincey]

FOURTH PART : CARBURETOR TUNING AND SYNCHRO

 

[Arde]

Cool setup. I had no idea there was a static vs. dynamic torque.
Thanks for the videos.

 

[eriknetherlands]

I also didn't know. Thanks for the education @deQuincey !

 

[deQuincey]

Removed plugs, 1000km

Also remember a mistake ....it is 70mm ideaoticus!

 

[deQuincey]

Funny, if two rear wheels are up in the air you can not move engine from one of them

I have to use the tool....

 

[deQuincey]

Update.

 

[deQuincey]

,






valve cover

special Nuts and front bolt Torque = 10 N.m

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