[Amc-list] 66 Ambo...compresion problem..new information

["Duane Hacking" <dhacking@xxxxxxxxxxxxxxxxxx>]

Thanx again all who replied.  Here's the latest.  Engine had the orginal
timing chain and gears and timing had not jumped.  Chain had a lot of
slack but  nylon gear looked great. Obviously I replaced the timing
chain and gears anyway.

     After putting it back together cranked engine again without spark
plugs while pouring sea foam down carb. Obviously after a bit it started
shooting out of the spark plugs holes.  I did this just to make sure it
was coming into chambers on intake strokes.  So now that I confirmed
that, I decided to put the plugs back in and see what might happen
trying to start it.  Also noticed all valves moving normally except
#6...one valve in # 6 cylinder still not moving as quickly as rocker arm
was moving...so I know there is a problem there with a valve sticking. I
decided to take another compression test just for the heck of it (again
checked  all cylinders except #  1 one as my compression tester does not
have the flexible hose attachment and a/c compressor is in the way) Now
#2,3 4 and 5 cylinder all have good compression and #6 zero compression.
I decided to put old spark plugs back in thinking I have enough
compression on at least 4 cylinders and maybe 5 cylinders if # 1 is okay
and if I can get it running; then can use sea foam (or other chemicals
recommended) while engine is running and it would be more effective if
sticking valve/valves is only problem.  Well, it fired right up all
right...but now have very loud clattering noise.  Had no noise at all
last time engine ran.  Afraid to keep it running-I shut it down.  This
noise was so loud; almost as loud as a rod knocking...but deffinatly
sounded like coming from upper engine; could be wrong...I've never done
any engine work on the sixes..just the v-8's, so I really don't have the
advantage of having heard abnormal noises like I have heard on the v8's
to really make an asessment.

       I also upon suggestion from one of the members let some gas from
the tank drain from inlet line of fuel pump; and as suspected it was
brown.  So all this probably just due to my own ignorance of not knowing
even after gas evaporates, it still leaves a very damaging residue. I
think I'll try to borrow a compression tester from someone at work that
I can get in # 1 cylinder and test it just to see if # 1 also has a
compression problem.  I do think # 1 has a problem also.  The reason I
think so  is while doing compression test, I managed to get my hand
crammed in behind the a/c compressor and one finger over the spark plug
hole slightly while having the engine cranked and didn't feel much
compression.  

     Even though I only let the engine run at the most 1 to 2 seconds
this time; the noise actually sounded like it was coming from the front
of the valve cover or engine area. 

     I'm not sure cranking engine with starter (with distributor wire
disconnected so it doesn't fire up) and pouring sea foam or other
chemicals down carb throat at this time will do anything even though it
obviously loosened up #'s 4 and 5.  If someone disagrees; let me know
and I'll try it some more, but  I think i'm about ready to pull the
head, disassemble it and clean it up.  (Clean up the mess I've made that
is!) 

Well, I guess that's about it.  Thanx again for all the replies!

Duane Hacking

71 Javelin SST/AMX clone

66 Ambassador 990

69 343/4bbl Rebel 2dr

duanehacking@xxxxxxxxxxxxx

Duane_hacking@xxxxxxxxxxxxxxxxxx

 

 

 

 

 

 

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