Low compression on three cylinders

70

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

123,965

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

Your Answer:

Ford Ranchero Experts

  • #1
    MrBlueOval
    Reputation
    220
  • #2
    dandyoun
    Reputation
    150
  • #3
    Js08016
    Reputation
    120
View All

Related Models For Sale

Used Ford F-150
2,319 Great Deals out of 198,937 listings starting at $1,300
Used Ford Mustang
297 Great Deals out of 39,759 listings starting at $1,312
Used Ford Falcon
36 listings
Used Ford F-100
167 listings
Used Ford Fairlane
86 listings
Used Ford Bronco
200 listings
Used Ford Torino
48 listings
Used Ford F-250
391 listings starting at $3,495
Used Chevrolet Camaro
242 Great Deals out of 26,934 listings starting at $2,900
Used Chevrolet Corvette
79 Great Deals out of 15,067 listings starting at $3,700

Used Cars For Sale

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.