10 Jul 2025, 18:22 [ UTC - 5; DST ]
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Post subject: Re: Piper Malibu Snafu Posted: 27 Jan 2020, 05:41 |
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Joined: 01/10/17 Posts: 2249 Post Likes: +1640 Company: Skyhaven Airport Inc
Aircraft: various mid century
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+1 give Kevin Meade a call.
Are EGT’s normal range compared to the other cylinders. It might help determine if it’s indication or actual problem
Do the CHT probes read the same at rest cold in the hangar? (internal problem in CHT gauge for that channel)
Engine ground cables correct? Alternator #1 or #2 off make any difference?
Intake runner hairline crack at the flanges?
Spark plug torqued correctly or missing a gasket? This should have not followed between engines or new cylinder but possibly if firewire plugs were reused in the same spots.
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Post subject: Re: Piper Malibu Snafu Posted: 27 Jan 2020, 07:15 |
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Joined: 10/29/14 Posts: 163 Post Likes: +43 Location: KVGT
Aircraft: PA46 310 P
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EGTs are ok, on the ground, after start, all CHTs are normal.... Yes... have spoken to Meade... he mentioned possibility of exhaust problem...but there are no heat marks anywhere else...
_________________ Now Flying Brand X
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Post subject: Re: Piper Malibu Snafu Posted: 27 Jan 2020, 10:16 |
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Joined: 03/23/08 Posts: 7357 Post Likes: +4088 Company: AssuredPartners Aerospace Phx. Location: KDVT, 46U
Aircraft: IAR823, LrJet, 240Z
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As sanity check you could try and slap on a caliper temp sticker in a few places. Not sure you will be able to find a spot though. But maybe it would help to isolate something. Hope you get a solid kill with something. Attachment: 967F0C80-AC77-4346-B1E9-EAC9AEA6BE91.jpeg
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_________________ Tom Johnson-Az/Wy AssuredPartners Aerospace Insurance Tj.Johnson@AssuredPartners.com C: 602-628-2701
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Post subject: Re: Piper Malibu Snafu Posted: 27 Jan 2020, 10:58 |
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Joined: 03/03/15 Posts: 39 Post Likes: +27 Location: KJGG
Aircraft: PA46-310P
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Larry,
I couldn't find a photo of your nosegear doors, but I assume your 1985 plane has SB 892A installed?
Things, I've noted from some photos you've posted elsewhere: I haven't seen photos of your engine since the OH, but the previous ones had all the plug wires laying on the top of the #4 instead of affixed to to the intake tubes. On the other side it was bundled but laying between the #3 and #5 cylinders. You replaced your baffling, but your original photos showed a lot signs where they were not touching the cowl and potentially laying down in the back on the pilot side. Were the seals at the back around the intercooler completely sealed?
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Post subject: Re: Piper Malibu Snafu Posted: 27 Jan 2020, 13:06 |
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Joined: 10/29/14 Posts: 163 Post Likes: +43 Location: KVGT
Aircraft: PA46 310 P
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Hello Ryan, Fellow Malibu driver... You leave few posts....so...thanks for any ideas...I have the louvre nose wheel doors I have some post OH I’ll upload... See what you think... Larry
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Post subject: Re: Piper Malibu Snafu Posted: 27 Jan 2020, 14:49 |
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Joined: 03/03/15 Posts: 39 Post Likes: +27 Location: KJGG
Aircraft: PA46-310P
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Username Protected wrote: Hello Ryan, Fellow Malibu driver... You leave few posts....so...thanks for any ideas...I have the louvre nose wheel doors I have some post OH I’ll upload... See what you think... Larry Looks much better than pre-OH. Any photos of the pilot-side? Just confirming you have 2 sets of louvers on the doors? The original doors had the two fwd built into the door and the SB added two more aft. Just being 100% certain. I can't believe there's any Malibus out there w/o the SB, but just checking. Not exactly how I would have installed the baffle seals in the aft corner, but I'm not an A&P either. I'd also have everything sealed with RTV (e.g. around the aft center and around the intercoolers). How does the seal around the oil cooler look? My scarce posting is somewhat intentional for at least a few more years. If I post infrequently and I can't get myself in trouble. 
Last edited on 27 Jan 2020, 14:59, edited 1 time in total.
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Post subject: Re: Piper Malibu Snafu Posted: 27 Jan 2020, 14:50 |
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Joined: 01/30/09 Posts: 3713 Post Likes: +2346 Location: $ilicon Vall€y
Aircraft: Columbia 400
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Username Protected wrote: The exhaust system was not OH....my shop said it was fine?!? They're never "fine" unless it was installed just prior to overhauling the engine. What instrument are you using the monitor the engine? Is it possible the instrument is defective? I've heard of many cases of the inter-cylinder baffles not being properly installed (or even missing entirely!).
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Post subject: Re: Piper Malibu Snafu Posted: 27 Jan 2020, 16:18 |
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Joined: 10/29/14 Posts: 163 Post Likes: +43 Location: KVGT
Aircraft: PA46 310 P
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Gentlemen, Yes, the nosewheel door louvre openings go full length. I know that well because they are hard to clean. No RTV used anywhere. Using an EDM 700. It actually is one of those upgrades from an old insight that had no numbers. I’m not sure if there is data downloads. I’ll see when I get the plane. The shop’s latest plan is to replace the cylinder. I’m not convinced.
_________________ Now Flying Brand X
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Post subject: Re: Piper Malibu Snafu Posted: 27 Jan 2020, 16:41 |
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Joined: 06/02/15 Posts: 3811 Post Likes: +2655 Location: Fresno, CA (KFCH)
Aircraft: T210M
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Quote: my #4 CHT would shoot to 450, after just a few minutes of takeoff or cruise climb. Cruise and descent were no problem. What do you mean by "no problem"? What temps are you seeing in cruise?
_________________ G3X PFD, G3X MFD, G5, GFC500, GTN750xi, GTN650xi, GTX345 Previous: TBM850/T210M/C182P APS 2004
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Post subject: Re: Piper Malibu Snafu Posted: 27 Jan 2020, 19:21 |
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Joined: 10/29/14 Posts: 163 Post Likes: +43 Location: KVGT
Aircraft: PA46 310 P
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Ok...I’ve got the most votes for an exhaust problem. Yes that is the only link between the old engine and the new. It was not OHd. I’m still at work. I’ll check the engine diagrams later. Maybe there’s a slip joint there. The shop doesn’t think so. So what testing should I ask about?
_________________ Now Flying Brand X
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Post subject: Re: Piper Malibu Snafu Posted: 27 Jan 2020, 21:38 |
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Joined: 10/29/14 Posts: 163 Post Likes: +43 Location: KVGT
Aircraft: PA46 310 P
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Ok... I’ve studied the maintenance and parts manuals... there are no good figures showing the exhaust system precisely in relation to the engine... any body have a good diagram? What’s near cylinder #4 in the exhaust system? Remember it’s a continental which numbers cylinders different from lycoming... it’d be the left middle cylinder... I’m looking at the Piper manuals—-
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