Itinerant Air-Cooled Greetings From Texas Y'All

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Amskeptic
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Re: Itinerant Air-Cooled Greetings From Texas Y'All

Post by Amskeptic » Sun Oct 23, 2016 4:00 pm

Latest post of the previous page:

sgkent wrote:check the rocker arm nuts to be sure they are torqued to factory spec. Don't tighten by feel. If a rocker arm stud nut is loosening that can cause it too. so can not being at TDC, or not feeling the lifter properly for zero lash. Colin will fix you up.
This was a Boston Bob engine that we had to remove shims from under the rockers in waayyyyy back I can't remember when, because the valve adjusting screws were contacting the valve covers! It has an additional 7,000 miles, and has developed a sharp rapping click that comes up when warm. We diagnosed valve train, re-adjusted valves, timing, etc, and test drove on September 21st.

His conclusion at the end of our valve adjustment/timing adjustment was that the engine was quieter. My conclusion at the end of the visit was "engine is running acceptably, the sporadic clatter when warm sounds valve train-related and not serious IF:
it does not deteriorate.

Now I am getting reports that the noise is more serious-sounding, but I am not sure I have heard the alarming sound, I only got our post-valve adjustment sound where he said it was reduced.

I like SG Kent's suggestion to recheck the rocker stand support nut torque values (11mm nuts / 10 ft/lbs @ TDC only).
An immediate valve adjustment after doing the above is mandatory. Please check for any signs of contact between the valve cover and any valve adjusting screws. If you have to paint the insides of the covers to better see if contact occurs, do so.

Please keep me posted!
Colin
BobD - 1978 Bus . . . . . . . . . . .111,130 miles
Chloe - 1970 bus . . . . . . . . . . . 206,787 miles
Naranja - 1977 Westfalia . . . . . 93,996 miles
Pluck - 1973 Squareback . . . . . 55,510 miles
Alexus - 1991 Lexus LS400 . . . 72,113 miles

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bradleygt
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Re: Itinerant Air-Cooled Greetings From Texas Y'All

Post by bradleygt » Sun Oct 23, 2016 7:18 pm

post visit re-start was delayed while i waited for my distributor advance to arrive from Cali- when i eventually got'er going again, it wasn't ten miles or ten minutes worth of driving until i heard the increased noise from the engine and that leads us back to my recent posting.....
it's a bay! '78 FI 2L Deluxe Campmobile

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