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Author
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Topic: 78 LTD II, 2 questions.
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CaseyJones302
Journeyman Posts: 12
From: Monroe, WA, USA
Registered: May 2003
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posted 05-19-2003 03:09 AM
   
I just picked this car up, it has under 70K miles, 302, runs awesome but has what sounds like a very light lifter tap. This is not audible while Im standing over it giving it a little gas, only while driving/idling and then only barely audible. while under the hood, the engine seems nothing other than perfectly smooth and quiet. Im stumped because I hear it from engine area, but when I get out and pop hood, it mysterously goes away. 1. any ideas what this sound might be? 2. the front split back bench seat seems to have no adjustment, how to adjust the backs, if no adjustment (4 door) what year/models have compatable adjustable seats?
I forgot how nice it is to have an honest, genuine, north american, corn-fed sedan, life is good once again!
Thanks for any help
Tony
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KULTULZ
Gearhead Posts: 391
From: Rockville, MD
Registered: Oct 2002
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posted 05-20-2003 01:24 AM
I would suspect an exhuast leak, especially within the theramactor system. If you will notice, the air pump supplies fresh air into the rear of the cylinder heads via a small crossover tube. This tube or mounting gasket(s) may be corroded. Also examine the check valve closely as if this is blown, will allow exhuast gases to leak back into the system. Exhaust manifold and donut gasket leaks (look for carbon trails).
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CaseyJones302
Journeyman Posts: 12
From: Monroe, WA, USA
Registered: May 2003
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posted 05-20-2003 04:33 AM
Everything back there is tight and in good shape. I pulled the old school backyard hose to the ear trick and could hear nothing abnormal back around the a/p check valve and injection manafold. maybe not related but I found the EGR valve to be defective (not holding vacuum in the chamber)so I fabricated a steel plate and sliped between the EGR valve and the mounting surface body w/new gasket (and plugged hose or course), this seems to have reduced the tapping sound slightly but increased low RPM/under load ping slightly. Can I block these air injection manafolds in the same manner as I did on the EGR valve just to eliminate the possability that they are leaking somewhere? they appear to be held on by one small bolt on each side. Thanks again for any further help. ps,the exhaust is all tight and in remarkable condition, but the dual exh system is coming very shortly anyway.
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KULTULZ
Gearhead Posts: 391
From: Rockville, MD
Registered: Oct 2002
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posted 05-20-2003 02:03 PM
quote:
Can I block these air injection manafolds in the same manner as I did on the EGR valve just to eliminate the possability that they are leaking somewhere? they appear to be held on by one small bolt on each side.
The 1977 had the retaining bolt actually go through the air supply tube so the hole in the head (?) will be tapped. It is 5/16-18 thread. You will most likely need a shorter cap screw with a gasket (D7DZ 9C735-A if still available or Fel-Pro) to eliminate the exhaust air supply tube.
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Moneymaker
Administrator Posts: 20651
From: Lyons, IL, USA
Registered: May 99
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posted 05-20-2003 05:00 PM
Welcome to M&M  !------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
First SS/MA in the TENS!
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
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CaseyJones302
Journeyman Posts: 12
From: Monroe, WA, USA
Registered: May 2003
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posted 05-20-2003 11:42 PM
I was outside with it for a while today and this is stumping me but good. The exhaust is tight, I can hear nothing by any of the air injection components. The whole exhaust/emissions system is in good repair.I think I will have a look under valve covers, I read something in the book about adjustable components on some models. Maybe something went awry there? I wont sleep until I trace this down! perhaps a bad lifter........ a bent pushrod, something along those lines. Thanks again for the help and the welcome.
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Moneymaker
Administrator Posts: 20651
From: Lyons, IL, USA
Registered: May 99
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posted 05-21-2003 06:24 PM
You might have a worn rocker arm fulcrum.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
First SS/MA in the TENS!
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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CaseyJones302
Journeyman Posts: 12
From: Monroe, WA, USA
Registered: May 2003
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posted 05-21-2003 09:33 PM
I FOUND THE NOISE!!
good news for me is its not in the engine at allBad news for me is that it appears to be coming from the transmission, loudest under the pan and towards the area of the front pump. The engine is quiet. I used a mechanics stethoscope to listen to this. there is no whine or buzzing, it works perfectly but sounds like IT has a collapsed lifter. I have never heard this from a tranny and, once again,I am stumped! Tony.
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SteveLaRiviere
Administrator Posts: 36059
From: Saco, Maine
Registered: May 99
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posted 05-22-2003 06:29 PM
Check for loose flexplate to converter nuts. I've run into that a few times.------------------
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CaseyJones302
Journeyman Posts: 12
From: Monroe, WA, USA
Registered: May 2003
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posted 05-22-2003 10:27 PM
The bolts are tight to spec. I cant see any cracks in the flexplate but Im beginning to suspect a crack that is not visible.All the cracked flexplates I have replaced on taxicabs (caprice/impalla) should have allerted me to this quicker. slightly different sound but its coming from that area. Louder in R than in D. It fits the profile. Of all the ford products I have owned and abused, I have never ever dammaged a flexplate. Has anyone ever heard of a torque converter making this sound? Looks like Im a-pullin' the tranny this weekend. hehe
Thanks for the advise.
Tony
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