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post #1 of 19 (permalink) Old 03-02-2009, 12:03 PM Thread Starter
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30K service/recommendations

Hi all! It's been a few weeks since we rolled over 30K miles on our XK. According to the service maintenance manual, I'm due for the following to-do's:

-Oil/filter change (petro mobile 5W-20 oil; done)
-Air filter change (not yet)
-Differential service (done)
-Replace spark plugs (not yet)
-Replace PCV valve (not yet... then again, where is it on the HEMI?)
-Fuel system service (thinkin of pouring a lucas gas additive cleaner on next fillup)
Check other areas....

Based on this, can you all provide me with some suggestions/recommendations. I totally forgot reading about the HEMIs using two plugs per cylinder (a whooping 16 spark plugs; a bit of overload compared to my Honda's 4 plug setup).


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post #2 of 19 (permalink) Old 03-02-2009, 12:50 PM
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Quote:
Originally Posted by XKJeep06 View Post
(a whooping 16 spark plugs; a bit of overload compared to my Honda's 4 plug setup).

Bigger engines = more plugs

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post #3 of 19 (permalink) Old 03-02-2009, 02:47 PM
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Double plugs are for better burn and/or better performance.

Aircraft have always had two plugs per hole. When you do a ''run up'' at the end of the runway, you turn the key from ''both'' to ''right'' then ''left'' to switch magnetos. The RPM drops a bit as each second set of plugs turn off. They do make a difference.

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post #4 of 19 (permalink) Old 03-02-2009, 05:20 PM
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Adondo;
Really? That is cool! I didn't know that you could switch the banks of plugs on and off in airplanes like that... Makes sense for safety, etc... Also proves there is a performance reason too if the RPM drops as you say... Neat!

XKJeep06;
I am still on the original plugs(I assume as I bought it at 20,00 0miles) and I have 45,000 on them....(I KNOW I AM BAD!!!) I am waiting for warmer weather to arrive before I attempt it. I have heard it is not quick and easy! I think I'll just go with the OEM plugs. I haven't had much luck with aftermarket performance stuff in my other vehicles, so I'm not going to start now....

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post #5 of 19 (permalink) Old 03-02-2009, 06:02 PM
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It's also for safety reasons as things are generally redundant in aircraft. The typical ignition switch in a Piper, Cessna, etc. says ''OFF ACC LEFT RIGHT BOTH START''

The left/right refs a set of magnetos. (Usually a pancake six cylinder Lycoming) And... magnetos are used because they're not dependent on battery power like automotive systems.

A run up is when you lock the brakes and run up the RPM to check everything. (While you're working the yoke to check control surfaces too) The magneto check makes sure they're both really working. The RPM will drop a couple hundred or so when a set of plugs dies.

Obviously, the automotive industry has figured out the double plugs idea works pretty good. The 2009 4.7L also has double plugs... the usual set as before, (On top, down deep tubes) and a second set in the normal position found on other engines. The wire crosses the valve cover and taps into the coils on top.

Personally, I’m glad I have the older 4.7L. The way it’s packed into the Commander would mean a five hour job to replace that second set. The ones on top aren’t too bad to access.

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post #6 of 19 (permalink) Old 03-02-2009, 08:54 PM
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im at 30k also. just did oil and air filter. the air filters are around 8 bucks, so i change them when i do the oil (until i get a CAI). used redline for the diff. dont know where the pcv is either. i imagine one on each valve cover? as for the plugs ive been eyeing the NGK G power single platinum (5017). the full platinum are too much. the single are only a buck more per plug. rockauto has them cheapest ive found so far. ive used berrymans fuel system cleaner in the past P# 2630 and it worked awesome. thinking about tryhing it , but not sure how sensitive the MAF is

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post #7 of 19 (permalink) Old 03-02-2009, 09:22 PM Thread Starter
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Quote:
Originally Posted by tripod View Post
im at 30k also. just did oil and air filter. the air filters are around 8 bucks, so i change them when i do the oil (until i get a CAI). used redline for the diff. dont know where the pcv is either. i imagine one on each valve cover? as for the plugs ive been eyeing the NGK G power single platinum (5017). the full platinum are too much. the single are only a buck more per plug. rockauto has them cheapest ive found so far. ive used berrymans fuel system cleaner in the past P# 2630 and it worked awesome. thinking about tryhing it , but not sure how sensitive the MAF is
Yeah, I'm about to pick up a new Fram or Purolator aif filter some time this week. Regarding spark plugs, considering getting some Autolite platinums. NGKs I'm sure work well with imports (like my Honda). Germans I believe use Bosch products. I'm curious to hear what others have experienced with the other available brands out there.

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post #8 of 19 (permalink) Old 03-02-2009, 09:47 PM
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My 3.7L V6 came with stock NGK V-Power plugs. I had the dealership replaced them with stock at around 35,000. I am glad I did too because the plugs look worn. You can hardly see the groove.



However, I still asked for the stock plugs. I should have spent a little more for the double Plat. NGK plugs.

I believe the fuel service is bs. As long as you dump a bottle of fuel injection cleaner in your tank every six months, it should be good. Just think, the Commander only has around 30k.

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post #9 of 19 (permalink) Old 03-03-2009, 11:37 AM
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I got a price at the dealership for the 30k service yesterday (I am 5k miles away from that now) for $629.
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post #10 of 19 (permalink) Old 03-03-2009, 12:13 PM
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Join Date: Mar 2008
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Quote:
Originally Posted by JJSEBASTIAN View Post
I am still on the original plugs(I assume as I bought it at 20,00 0miles) and I have 45,000 on them....(I KNOW I AM BAD!!!) I am waiting for warmer weather to arrive before I attempt it. I have heard it is not quick and easy! I think I'll just go with the OEM plugs. I haven't had much luck with aftermarket performance stuff in my other vehicles, so I'm not going to start now....
On the Hemi, quick - no; easy - well, not too bad. If you have an assortment of extensions and universal joints for your socket, accessing the plugs isn't too bad at all. The worst part for me was pulling off 2 of the coil packs. The boots wouldn't let go and 1 for each of 2 cylinders was left in the tube. It was a royal PITA to get them out. In the end it seems there wasn't quite enough grease on the boot, so the rubber stuck to the plugs. I transferred one boot from one coil pack to the other, and then bought 1 new coil pack (I couldn't find a source for just the boot).

Just remember to use dielectric grease on the boots when you've replaced those plugs! It'll make the next time easier.

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