Packard Forum Index » Pre-War (1899-1942)

From just a few weeks ago, have pulled the head off again along with the intake and exhaust manifolds. Low compression in several cylinders. The tar like substance is in the intake manifold and in the intake ports. What is going on?
When I had the manifolds machined they used some sort of lubricating fluid?
A leaking intake manifold sucking in exhaust?
Since the last valve job a few weeks ago only started maybe seven times to do adjustments, let in run for around 15-20 minutes each time to get rid of condensation.
Thanks Todd

Attach file:

---

  packard1.jpg (114.06 KB)


  packard2.jpg (115.91 KB)


  packard3.jpg (89.33 KB)

Do you have fresh, clean gasoline in the tank?

I thought so. But, most of it is probably around a couple months old.
That's an awful lot of goo for just several starts? When I did the valve job a few weeks ago, had just a bit of that in each intake from around 15 years of build up. Perhaps the intake manifold had a large build up that I missed and now started to melt from the several starts? Maybe need to boil out the intake manifold? It does look a bit shiny when looking down from the carburetor mount.

It's not normal. Stale gas can cause that. I've seen deposits of what looked like molasses form in the intake of a new lawn mower engine that only ran about ten minutes before the intake valve stuck open. Stale gasoline caused it. The goo was hard to remove, too. Your exhaust ports don't look too bad. I would wash out the intake manifold and try to clean out the intake ports and valve stem area. Then I'd drain all the gas out of the tank and lines and carburetor. Check that the crankcase oil looks and feels normal and doesn't smell like stale gas.

Will do, thanks