[DRACO A5OG]

Master Rebuilders,

I am posting this for one of our Pelicans that has a 76 Turbo Look Cabrio with a 2.7.

So last weekend, I was sharing with him how to do a valve adjustment and we pre-adjust measured all valves.

When we got to #6 lower valve, we found the lash to be literally at around 5.00MM gap loose. We verified this twice and then after we adjusted the elephant foot was nearly bottomed out, the nut was literally at the end of the stem. So I instructed him to turn the pulley again and we checked again then there was ZERO gap, so we re-adjusted it again to spec, then stem was higher over the nut but still compared to the rest of the valves, it was still turned it quite more than the rest.

I am suspecting, there may be some carbon build up or maybe the spring is broken or lost it's tension?

Once engine is back in, we are going to remove heat exchangers and check the exhaust port valve for carbon.

Have any of you every encountered this when adjusting the valves where the gap was super loose? Maybe carbon build up, bent Rocker Arm, Weak Spring???

History: a P-shop did the valve adjust 15-18K ago. I can not imagine they would leave such a wide gap.

TIA for Matt,

Jim

P.S. We also discovered #3 upper valve stem was hitting the valve cover, again bent rocker arm, Maybe? Gap was close to spec prior to adjustment.