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I have always followed the Richard Atwell guide when adjusting lashCJH wrote:When I started the engine this morning all the tappets were nice and quiet. There may be something in this extra pre-load after all. Made me doubt whether I should touch them again, but nevertheless I warmed up the oil and then backed off all the adjusters to let the tappet plungers spring back to their natural position. The trouble is, whatever position the crank is in, two valves will always be under load, and even with the adjusters wound right out the rocker arm still rests on top of the valve and therefore puts some load on the corresponding tappets. I may have to do this in two stages - once to do the six tappets that are fully unloaded, and once more to do the last two. I guess I could have removed the rocker assembly.
kevtherev wrote: I have always followed the Richard Atwell guide when adjusting lash
Richard Atwell wrote:Remember that when turning the adjusting screw on the engine you are working against the valve spring if the lifter is full of oil. You can test this by pressing on the knurled base of the rocker arm with a screwdriver. If there is any movement, then the lifter is soft and your adjustment will be compressing the spring inside the lifter instead of moving the valve spring (normal). If this happens, you should run the engine with a 0.006" (0.15mm) clearance on that lifter for 10-15 minutes then re-attempt a hydraulic adjustment when the hot valve cover cools enough for you to touch it again.
CJH wrote:
Good advice to go back to the guide. There's a tip for dealing with my compressed plunger:
Richard Atwell wrote:Remember that when turning the adjusting screw on the engine you are working against the valve spring if the lifter is full of oil. You can test this by pressing on the knurled base of the rocker arm with a screwdriver. If there is any movement, then the lifter is soft and your adjustment will be compressing the spring inside the lifter instead of moving the valve spring (normal). If this happens, you should run the engine with a 0.006" (0.15mm) clearance on that lifter for 10-15 minutes then re-attempt a hydraulic adjustment when the hot valve cover cools enough for you to touch it again.
itchyfeet wrote: you can set preload on a tappet with air inside but you need to be gentle and dexterous, you can feel the point it is just touching before compressing the internal spring but its subtle, you do need to make sure pushrod is seated correctly which is always the tricky bit.
bigbadbob76 wrote:I wasn't sure if the 18bhp transmission loss included rolling resistance or not.