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

111,015

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

Your Answer

Add photo

Related Questions

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
2,059 Great Deals out of 207,339 listings starting at $1,499
Used Ford Mustang
543 Great Deals out of 45,845 listings starting at $1,999
Used Chevrolet Camaro
243 Great Deals out of 31,194 listings starting at $369
Used Ford F-100
146 listings
Used Chevrolet Corvette
150 Great Deals out of 20,684 listings starting at $3,995
Used Ford F-250
469 listings starting at $2,000
Used Ford Torino
33 listings
Used Ford Falcon
32 listings
Used Chevrolet Impala
590 Great Deals out of 34,066 listings starting at $899
Used Dodge Challenger
211 Great Deals out of 23,432 listings starting at $7,990
Used Ford Bronco
203 listings

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.