Reply With QuoteBack off til it rattles, tighten to zero lash (that's when it just shuts up) then give it half a turn. That's it.
Nino.
Master
I'm about to kick over a 186 after a head off/on.
The "rockers" are held on with nyloc nuts.
I only removed two, the ones on no.6, to check the valves. As I suspected, the exhaust was a bit pitted so I ground it in. I replaced the rockers them & tightened until they were just nipped up.
I'm assuming I now start up & adjust as necessary?
i.e. Too tight = misfire, back off. Too loose = tappet noise, tighten up.
As the head gasket was new, I intend to start up then back off each rocker in turn till they rattle then tighten till they go quiet.
Hav I got it right?
Master
Back off til it rattles, tighten to zero lash (that's when it just shuts up) then give it half a turn. That's it.
Nino.
AT REST
The way I used to adjust 186 rockers was, start with just loose rockers, warm up engine, let idle with the cover off, turn down each rocker about 1/2 turn past quiet, wait for the lifter to readjust itself and go to the next one. They will self adjust after a few seconds on idle with warm oil.
Master
The only problem with that is oil will spray everywhere with the rocker cover off
AT REST
Warm it up first, take the lid off and idle it slowly. It's not that bad.Originally Posted by Series3 GT
Master
BeeUtey is quite right!
I've hade decades of adjusting BMC engine tappets while running.
Why, when the factory recommends cold engine adjustments?
I found that as engines age, the wear at the tappets means that stationary gaps have no bearing on the running situation.
I use to warm up, remove the rocker cover at idle then listen to each tappet with a sophisticated stethoscope i.e. a length of garden hose stuck in my earhole.
Oil only sprays when you rev it up.
I use a long-shafted screwdriver for the same purpose - but put it on the 'journal', not the moving rocker (so I don't pound the handle of the screwdriver into my skull). You get to hear a lot of what's going on...
Master
Ok, It's just that when we started our Disco 2 with the rocker cover off it sprayed anything and everything
Master
Wow! What's the oil pressure on those Rover V8's??
Holdens are, from memory, very low esp at idle.
I use the Scredriver Stethoscope more for diagnosis of bearing noise etc where the noise is "amplified" by travelling thru a solid medium and not thru air. I use the Hose Stethoscope to locate a noise eg one tappet among 8 or 12, front of generator vs rear, niggling exhaust leaks etc etc.
On my 2.25 I used my thumb to determine which tappet was chattering
Just let the engine idle with the rocker cover off and run my thumb down the line of rockers, applying a little bit of downward pressure. The noisy one will stop when your thumb is on it.
I also adjusted it (gently) while running with a ring spanner and screwdriver.
When they were all (relatively) quiet I stopped the engine and checked them all again with a feeler gauge.
Some were slightly tighter than others but it's all good.
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