6 replies to this topic

[ministe]

Hi

Could anyone tell me what the correct tappet clearance is for a 1990 998 mini engine please. Just about to check mine but can't find my Haynes manual!

Thanks for any help.

[me madjoe 90]

12thou or 0.30mm

on all engines unless modifyed with none standerd rockers and so on

Quick way to cheak the tappet/valve/rocker clearance is to:

Roatate the crank until no.1 cylinder is at TDC on comprestion both valves closed.
Now cheak.
cyl no.1 Inlet and exhuast valves
cyl no.2 Inlet valve
cyl no.3 exhuast valve

Now rotate the crank unlit cylinder no.4 is at TDC on comprestion both valves closed.
Now cheak.
cyl no.4 Inlet and Exhuast valves
cyl no.3 Inlet valve
cyl no.2 Exhuast valve

Have fun

Edited by me madjoe 90, 25 January 2011 - 05:12 PM.

[bmcecosse]

If you don't want burned out exhaust valves - keep them at 15 thou.

[me madjoe 90]

If you don't want burned out exhaust valves - keep them at 15 thou.

But then its like a sewing machine, i mean its like a sewing machine at 12 thou

[samsfern]

12 thou inlet and exhaust on a cold engine. I always use adjust the one opposite to the one fully open, for example if valve 8 fully open ill adjust no.1, valve 3 fully open ill adjust number 6. Great fun on straight 8 cylinder engines, lol.

Edited by samsfern, 25 January 2011 - 07:02 PM.

[bmcecosse]

MG/Rover increased the gaps to 15 thou - for good reason..........

[afoggo]

i just done mine, at 0.40mm and its running rather nicely.

if im right in saying the haynes manual said 0.40mm to 0.60mm would need to double check my haynes.

Edited by afoggo, 25 January 2011 - 07:39 PM.