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12-08-2014, 07:26 AM
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Join Date: Aug 2007
Location: Ontario, Canada
Posts: 2,291
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Am faced with changing two cylinders on an O-320 with exchange overhauled units this coming weekend. Wondering if anybody has the appropriate "how to" section of Lycoming manual in soft copy as I suspect we'll need to select the proper pushrods for these O/H'd cylinders?
If you have the appropriate section of the Lycoming manual in soft copy and could share it I'd be grateful.
Last edited by Canadian_JOY : 12-08-2014 at 07:38 AM.
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12-08-2014, 09:15 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Section 5 of the Owners Manual - one version here - big file...
http://www.8kcab.com/Checklists_file...n%20Manual.pdf
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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12-08-2014, 12:10 PM
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Join Date: Aug 2007
Location: Ontario, Canada
Posts: 2,291
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Thanks, Gil - that's just what I was looking for!
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01-04-2015, 11:29 PM
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Join Date: Nov 2009
Location: Irvine, CA
Posts: 32
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Finally I checked all the Cam travel in my O-320 B3B engine....
Exhaust cam travel, Cyliner 1/2/3/4 = 0.352"/0.333"/0.348"/0.359"
Intake cam travel, Cylinder 1/2/3/4 = 0.349"/0.346"/0.348"/0.351"
Only cylinder #2 exhaust cam travel is a little bit weak = 0.333", all others are right around 0.350". Good to know that the cam/tappet doesn't have abnormal wear. Thanks for the advise. It's a great learning experience.
My next task is to bring Dry tappet clearance back to spec (0.028" -- 0.080").
Last edited by jayyau : 05-22-2016 at 12:13 AM.
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01-04-2015, 11:53 PM
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Join Date: Apr 2012
Location: Tampa (BKV)
Posts: 926
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Adjustable? Why? If you're out of spec, change the push rod for another size to bring it in spec. Pretty easy to do.
__________________
RV-8 Flying
1,235th flying RV8
SARL Race#95
SnF Homebuilt Judge
2015 Sun n Fun Kit Built Reserve Grand Champion
2015 Oshkosh Kit Built Champion
2015 Jeffco Kit Built Grand Champion
2014 Oshkosh Outstanding Workmanship Award
Broken Warrior of the Jarhead Clan
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01-05-2015, 07:02 AM
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Join Date: Jan 2007
Location: Dowagiac, MI
Posts: 375
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Rockers can also vary slightly, you may be able to accomplish some changes by swapping rockers between cylinders if you are doing more than one cylinder or have extras rockers.
__________________
Bill Greenley
My RV-10 is now travel, watch out world!!!!!!
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01-05-2015, 01:27 PM
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Join Date: Aug 2007
Location: Ontario, Canada
Posts: 2,291
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Recently replaced two cylinders with overhauled units on an O-320-E2G. Overhaul shop indicated that -12 pushrods were really uncommon for installation with overhauled cylinders. I knew I had removed one -12 and the other three units were -13's. Just to be safe I ordered a set of 4 -14's and 4 -15's. When we installed the overhauled cylinders we found that one valve definitely needed a -12 (thank goodness we had one on hand). Two valves required -13's. The last valve was just barely in spec (0.030 clearance) with a -13 pushrod and could well have done with a -12 rod.
All of this just to say... make sure you've tried all the options as far as different pushrod lengths.
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01-05-2015, 02:04 PM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,768
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Quote:
Originally Posted by jayyau
Finally I checked all the Cam travel in my O-320 B3B engine....
Exhaust cam travel, Cyliner 1/2/3/4 = 0.352"/0.333"/0.348"/0.359"
Intake cam travel, Cylinder 1/2/3/4 = 0.349"/0.346"/0.348"/0.351"
Only cylinder #2 exhaust cam travel is a little bit weak = 0.333", all others are right around 0.350". Good to know that the cam/tappet doesn't have abnormal wear. Thanks for the advise. It's a great learning experience.
My next task is to bring Dry tappet clearance back to spec (0.028" -- 0.080").
Any one has the experience with adjustable push rod? if so, where did you get it?
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Interesting that #2 & #3 exhaust have such different lifts when they both operate off of the same cam lobe. What and I missing?
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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01-06-2015, 12:37 AM
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Join Date: Nov 2009
Location: Irvine, CA
Posts: 32
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Hi Mel,
That was an over all travel, included the tappet.
Since I'm going to replace all the tappet sockets, I'll re-measure it again to confirm the number.
My dial indicator setup was a little bit awkward at the time of test, I finally bought a nice tool to finish the job.
This is the tool I bought from Harbor Freight, it worked very well checking the cam travel. I didn't use their dial indicator, I have a better indicator to do the job.
Here is the link for the tool....
http://www.harborfreight.com/clampin...tor-93051.html
Last edited by jayyau : 01-06-2015 at 10:09 AM.
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01-06-2015, 12:40 AM
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Join Date: Nov 2009
Location: Irvine, CA
Posts: 32
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Dry Tappet clearance
Last edited by jayyau : 05-22-2016 at 12:14 AM.
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