Engine timing, valve train,  M110

Checking and machining valves

 

 
05—280 Checking and machining valves

 
Data

 

 
Intake valve
Exhaust valve Version 1
Exhaust valve2) Version 2
Valve retainer dia.
45.1-45.3
37.0-37.2
38.9-39.01
Valve stem dia.
8.95-8.97
10.94-10.96
8.94-8.96
Valve length
115
118
118
Code number at end of stem
E 110 06 E 110071)
A 110 00 A 110 00 C
A 117 00 A 117 00 C
Filled-in sodium
without
with
with
Valve seat plating
with
with
with

 
When new
1.5
2.5
2.5

 
Height ,,h” of valve retainer

 
Limit value
1.0
2.0
2.0

 
Width ,,b” of valve seat
1.8-3.0
1.5-2.5

 
Dia. ,,d” on valve seat center
44.2
36.1
38.0

 
When new
2.1-2.3
3.1-3.3
3.1-3.3

 
Height ,,m” up to valve seat center

 
Limit value
1.6-1.8
2.6-2.8
2.6-2.8

 
Adjusting angle for machining valves
45°+ 15′

 
Permissible runout on valve stem and valve seat max.
0.03

 
Permissible runout at face of valve stem when held at valve stem
0.015

 
•) Valve with spherical section.
2) Standard (except emission controlled engines) starting April 1978. Emission controlled engines starting model year 1980.
m110 - 0175-1.jpg
1 Valve seat plating

 
Conventional tools

 
Valve cone grining machine
or
Valve cone machining tool
e.g. made by Krupp, D-5309 Meckenheim model VS
e.g. made by Hunger, D-8000 Miinchen 55 type VKDR 1, order no. 203.00.200

 
05.2-280/1 F3

 

 

 
Note
The exhaust valves are filled with sodium!
Observe safety regulations when scrapping. Because of the danger of explosion sodium filled valves must not be melted or converted into tools (punches, etc.), without first removing the sodium filling.
Be careful when removing sodium from valves, since sodium reacts violently and explosion-like when com­bined with water and watery solutions, to avoid any risk of fire caused by the resulting hydrogen gas.
Sodium from cut and broken valves can be neutralized in the open air in a vessel container in a mixture of 2 liters of spirits of alcohol and 1 liter of water.
Sodium filled valves can be collected and sent for neutralization to the Warranty Checking Department at Stuttgart-Unterturkheim.

 
Checking and machining
m110 - 0176-1.jpg
1 Clean valves and inspect visually.
Valves with a burnt valve head, with insufficient height ,,h” of valve head and valves with a worn or scored valve stem, must be replaced.

 
2 Check valve stem runout. If runout measure ex­ceeds 0.03 mm, replace valve.
m110 - 0176-2.jpg

 
05.2-280/2 F2

 

 

 
3   Machine valve seat.
Observe instructions supplied with machining equip­ment and adjusting angle of 45°.
4   Measure valve seat runout and valve head height
m110 - 0177-1.jpg
Replace valve, if limits have been reached.

 
05.2-280/3 F2