engine noise....????

Hawkeyenfo · Post by **Hawkeyenfo** » Tue Oct 16, 2007 5:22 am

Sorry, no progress yet. Just getting the new radio installation completed and then it's off to the "other" shop to have the NOISE listened to, new generator gasket/seals and new weight and balance. Same here though, no one is majorly concerned.............

tailpilot · Post by **tailpilot** » Wed Oct 17, 2007 1:46 pm

I had someone else listen to the plane the other day. We pulled the prop thru and they did notice my phase coupler was pretty loud, thought this maybe the sound when the engine was running. We started it up and he also thought that it may be a valve or two that has too much slop in it. As soon as teh weather clears up and I get some time I am going to take it to the shop to have the mechs. look into the valve adjustments..........I sure hope this works.......The engine runs great, it just doesnt seem right to have a knocking sound comming from a fresh engine........

tailpilot · Post by **tailpilot** » Fri Oct 19, 2007 9:10 pm

I had a mech come out an listen to the noise. We pulled the cowl off and started up the plane. The Mech. used a stethascope lookin thing and listend to all of the cyl. He noticed that the #5 was making alot of knocking noise. We pulled off the valve cover and noticed the rocker arm on the intake valve had alot of play where the others were tight. We took off the rockers on that cyl. and then pulled and pushed on the push tubes......when we did this we noticed that the push tube on the exhaust would slide in and out without making any noise. When we pushed and pulled on the tube on the intake side it just bottomed out and made a distictive ping sound....just like the one when the engine was running.....whe then pulled out the hyd. lifter and discovered that it was not working properly......it was not holding pressure...something must be wrong with the little ball valve in the lifter that would not allow it to pump up.......I am having a new lifter overnighted to me....should be here tomorrow.....ill let you know if this fixes my knocking sound........so far it seems to be a faulty hyd lifter that was not pumping up.....and the knocking sound was the push tube banging on the top of the lifter....like I said it was the exact same noise we heard when the engine was running......

Hawkeyenfo · Post by **Hawkeyenfo** » Sun Oct 21, 2007 12:12 am

Sounds like good news for you! I hope it solves the noise.

My radios are in and 39A's at the shop now. New weight and balance complete (old one was incorrect!), new garlock seal on the generator...oh, and new/reman generator (old one had badly worn brushes and bearings with a lot of play and noise), and a new intake pushrod on the #5 cylinder!! My mech found a good hyd lifter but the intake rod had excessive play and he found that it was the wrong length....weird! Just one? Apparently sooooo. Anyway, once the gen goes back in on monday, we'll run it up and see if the noise is eliminated (got my fingers crossed)

Good luck, I'm looking forward to hearing how it goes!

Chris

blueldr · Post by **blueldr** » Sun Oct 21, 2007 1:39 am

Tailpilot,

OK! You win. I'm throwing in the towel. I've been working on airplanes since 1941 when I went to work for Lockheed, but you finally got me.

What in hell is a "phase coupler", and what kind of a noise do they make?

n2582d · Post by **n2582d** » Sun Oct 21, 2007 3:12 am

My guess is it's the Star Trek version of an impulse coupling.

Hawkeyenfo · Post by **Hawkeyenfo** » Tue Oct 23, 2007 2:53 am

Well, did you get the new hyd lifter installed?

Chris

Metal Master · Post by **Metal Master** » Tue Oct 23, 2007 12:08 pm

blueldr wrote:Tailpilot,

OK! You win. I'm throwing in the towel. I've been working on airplanes since 1941 when I went to work for Lockheed, but you finally got me.

What in hell is a "phase coupler", and what kind of a noise do they make?

Thanks for asking I just couldn't bring my self to ask. Then! Language changes over time and I am sure the Star Trek response is right on the mark. I think the noise depends on how strong the tractor beam is pulling on your ship.

tailpilot · Post by **tailpilot** » Tue Oct 23, 2007 9:15 pm

ok ok.........

Your right impulse coupler..

Someone else called it that and it stuck in my head......

tailpilot · Post by **tailpilot** » Tue Oct 23, 2007 9:19 pm

Chris,
I did get the new Hyd lifter installed........not much change.......the soud is very slightly quiter

He went and collapsed both lifters on the #5 and checked the slop......it was about 90 I guess the limit is 30-110 it is within limits but I went ahead and ordered two 30 over push rods to see if that will quiet things........so far no luck.........It is starting to drive me crazy now......the lifter was bad and we hoped that was going to fix to problem.....but no

cessna170bdriver · Post by **cessna170bdriver** » Tue Oct 23, 2007 10:19 pm

tailpilot wrote:... He went and collapsed both lifters on the #5 and checked the slop......it was about 90 ...

Did he collapse the lifters with the cylinder on the engine? If so how?

Miles

tailpilot · Post by **tailpilot** » Tue Oct 23, 2007 11:12 pm

No. We pulled the Cyl. back just enough to get to the lifters. We then used a small piece of safety wire to grab the lifter an pull it out.

kloz · Post by **kloz** » Tue Oct 23, 2007 11:34 pm

It will take the lifters a while to build back up. Give them some time.

tailpilot · Post by **tailpilot** » Wed Oct 24, 2007 12:03 am

about how long........I was out of town...but my dad went out there for me...they ran the engine up twice once at idle and the next time from idle to 1500 rpm.....a total run of about 5 minutes each........I was wondering if I just need to take it up flying for about 30 min to 1 hour and see what happens.........Ill prob. just waite till I get the new push rods in and then try that........I sure hopes this fixes this knocking noise.....We are sure it is comming from the #5 Cyl. the engine only has about 50 hours since major.....with new millineum cyls.

kloz · Post by **kloz** » Wed Oct 24, 2007 2:21 am

IIRC the overhaul manual says a flight of about 45 minutes to 1 hour.