Low compression on three cylinders

40

Asked by Jun 21, 2014 at 03:54 PM about the 1975 Ford Ranchero

Question type: Maintenance & Repair

I just purchased this car and got it running.  It runs rough, misses and doesn't idle
properly. A compression check showed no 5 cylinder was only 30psi.  I added oil to
determine if it was valves or rings, I think I added too much oil.  I pulled the engine and
was pleasantly surprised to find the engine is in great shape, recently overhauled.  I
pulled the piston on no 5 and found the rings and cylinder in great shape.  I pulled the
exhaust valve and found it was NOT seating.  Since it has hydraulic lifters I didn't try to
adjust them.  Two other exhaust valve appear to not be seating.  I have lapped them in
and reassembled the head.  Now I am wondering if the valves are too long,  How does
on check that?  Any discussion would be appreciated.   Gary

1 Answer

101,385

Improper push rod adjustment will not allow them to close properly.

Your Answer

Add photo

Related Questions

  • Why is my car over heating? 4 answers

    I have a 1960 Ford Ranchero. It had a straight 6 cylinder. I took it off and put a 289, i put a rack and pinion on it, i put power steering, and i put ac in it. When i did all this i ran out of room...

    1960 Ford Ranchero

    -

    Maintenance & Repair

  • Old ford drum brakes 2 answers

    I have a 1977 Ford ranchero. All of a sudden one morning after warming up engine it felt like the brakes were dragging really bad. So I lifed one rear wheel at a time and removed tire and took the...

    1977 Ford Ranchero

    -

    Maintenance & Repair

  • low compression 1 answer

    I have done a compression test on the ford windstar 3.8 engine and found that the engine seems to be running rouqh becuase cylinder one has 90 lbs , cylinder two has 80 lbs , cylinder five has 70 lbs...

    2000 Ford Windstar LX

    -

    Maintenance & Repair

  • I have a 1998 Taurus and I have no heat and low compression on #1 cylinder what could be wrong 2 answers

    I have a 1998 Taurus and I have no heat and low compression on #1 cylinder. My car misfires when it is at an idle. Does any one know what could be wrong?

    1998 Ford Taurus

    -

    Maintenance & Repair

  • Low compression in #1 cylinder 1 answer

    1993 Ford F-250 2 Dr XL Standard Cab LB

    -

    Maintenance & Repair

Search Ford Ranchero Questions

Ford Ranchero Experts

#1 MrBlueOval
MrBlueOval
Reputation 190
#2 dandyoun
dandyoun
Reputation 150
#3 Michael Tutty
Michael Tutty
Reputation 120
View All

Related Models For Sale

Used Ford F-150
3,379 Great Deals out of 203,977 listings starting at $1,273
Used Ford Mustang
727 Great Deals out of 38,316 listings starting at $1,750
Used Ford Thunderbird
30 Great Deals out of 1,146 listings starting at $6,995
Used Chevrolet Camaro
660 Great Deals out of 39,303 listings starting at $2,995
Used Dodge Charger
550 Great Deals out of 28,745 listings starting at $2,275