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One Cylinder on an M14 Running Hot??

 
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fighterguy



Joined: 11 Aug 2014
Posts: 17
Location: United States

PostPosted: Wed Apr 03, 2019 10:04 am    Post subject: One Cylinder on an M14 Running Hot?? Reply with quote

Hello All,

I would like to ask your opinion on an engine issue: I have one cylinder on my M14P that is running about 40 deg C hotter than the rest. (I have a fancy, 9 cylinder CHT instrument, like a JBI). It was #3 running hot

I swapped the leads with #4 cylinder and the indication followed the cylinder - #4 is indicating hot now = so, in fact the cylinder #3 is running hot and indicating properly I think....?

I checked the intake tube for tightness and such, pulled the plugs - they look OK, perhaps a bit white....ish (hot) but not real bad.

I am not sure what to check now or where to look for the problem........and ideas?

I really appreciate any advice or help you can provide.

Thanks all!


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PostPosted: Wed Apr 03, 2019 11:14 am    Post subject: One Cylinder on an M14 Running Hot?? Reply with quote

I'm not clear about what you said. When you swapped the probes between #3 and #4, did the #4 cylinder indicate hotter than what it was before you swapped the probes?

Dennis




On Wednesday, April 3, 2019, 2:06:57 PM EDT, fighterguy <deanandsteph2013(at)gmail.com> wrote:




--> M14PEngines-List message posted by: "fighterguy" <deanandsteph2013(at)gmail.com (deanandsteph2013(at)gmail.com)>

Hello All,

I would like to ask your opinion on an engine issue: I have one cylinder on my M14P that is running about 40 deg C hotter than the rest. (I have a fancy, 9 cylinder CHT instrument, like a JBI). It was #3 running hot

I swapped the leads with #4 cylinder and the indication followed the cylinder - #4 is indicating hot now = so, in fact the cylinder #3 is running hot and indicating properly I think....?

I checked the intake tube for tightness and such, pulled the plugs - they look OK, perhaps a bit white....ish (hot) but not real bad.

I am not sure what to check now or where to look for the problem........and ideas?

I really appreciate any advice or help you can provide.

Thanks all!

Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=488482#488482

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dsavarese0812(at)bellsout
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PostPosted: Wed Apr 03, 2019 11:20 am    Post subject: One Cylinder on an M14 Running Hot?? Reply with quote

I'm not quite clear on what you just described. So let me ask this. When you swapped the probes between #3 and #4 cylinders, did the #4 cylinder read hotter than what it was before you swapped the probes?
Dennis


On Wednesday, April 3, 2019, 2:06:57 PM EDT, fighterguy <deanandsteph2013(at)gmail.com> wrote:




--> M14PEngines-List message posted by: "fighterguy" <deanandsteph2013(at)gmail.com (deanandsteph2013(at)gmail.com)>

Hello All,

I would like to ask your opinion on an engine issue: I have one cylinder on my M14P that is running about 40 deg C hotter than the rest. (I have a fancy, 9 cylinder CHT instrument, like a JBI). It was #3 running hot

I swapped the leads with #4 cylinder and the indication followed the cylinder - #4 is indicating hot now = so, in fact the cylinder #3 is running hot and indicating properly I think....?

I checked the intake tube for tightness and such, pulled the plugs - they look OK, perhaps a bit white....ish (hot) but not real bad.

I am not sure what to check now or where to look for the problem........and ideas?

I really appreciate any advice or help you can provide.

Thanks all!

Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=488482#488482

http://www.matronics.com/Navigator?M14PEngi - MATRONICS WEB FORUMS -

/wiki.matronics.com" rel="nofollow" target="_blank">http://wiki.matroni=======================
</; &nb --> http://www.matronics.com/contribution


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fighterguy



Joined: 11 Aug 2014
Posts: 17
Location: United States

PostPosted: Wed Apr 03, 2019 11:21 am    Post subject: Re: One Cylinder on an M14 Running Hot?? Reply with quote

Hey Dennis,

Sorry for the confusion. #3 has been indicating hot for a while, but only at high power. At idle and low power it was normal.

So I swapped leads with #4 cylinder. Then #4 was indicating hot and #3 was normal - so I assumed the leads are OK and the #3 cylinder is actually running hot.

Smile


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PostPosted: Wed Apr 03, 2019 11:32 am    Post subject: One Cylinder on an M14 Running Hot?? Reply with quote

No, I disagree. If after swapping the probe #3 was normal and #4 was reading hot, then your problem is most likely a bad lead.  ie: The problem followed the probe. Did not stay with the same cylinder.
Dennis


On Wednesday, April 3, 2019, 3:23:30 PM EDT, fighterguy <deanandsteph2013(at)gmail.com> wrote:




--> M14PEngines-List message posted by: "fighterguy" <deanandsteph2013(at)gmail.com (deanandsteph2013(at)gmail.com)>

Hey Dennis,

Sorry for the confusion. #3 has been indicating hot for a while, but only at high power. At idle and low power it was normal.

So I swapped leads with #4 cylinder. Then #4 was indicating hot and #3 was normal - so I assumed the leads are OK and the #3 cylinder is actually running hot.

Smile

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fighterguy



Joined: 11 Aug 2014
Posts: 17
Location: United States

PostPosted: Wed Apr 03, 2019 11:58 am    Post subject: Re: One Cylinder on an M14 Running Hot?? Reply with quote

Hi Dennis,

I am not sure that is correct, and sorry if I am being dense but....

The #3 cylinder was indicating high to start with. So I swapped leads with #4 cylinder - put the #3 lead on #4 cylinder, and vice versa. So....#3 INDICATION is reading #4 cylinder....and #4 INDICATION is reading #3 cylinder.

After the switch, #3 indication (#4 cylinder) was reading normal, and the #4 indication (#3 cylinder) was reading HIGH!

Smile


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fighterguy



Joined: 11 Aug 2014
Posts: 17
Location: United States

PostPosted: Wed Apr 03, 2019 1:34 pm    Post subject: Re: One Cylinder on an M14 Running Hot?? Reply with quote

Hi Dennis,

I am not sure that is correct, and sorry if I am being dense but....

The #3 cylinder was indicating high to start with. So I swapped leads with #4 cylinder - put the #3 lead on #4 cylinder, and vice versa. So....#3 INDICATION is reading #4 cylinder....and #4 INDICATION is reading #3 cylinder.

After the switch, #3 indication (#4 cylinder) was reading normal, and the #4 indication (#3 cylinder) was reading HIGH!

Smile


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PostPosted: Wed Apr 03, 2019 2:15 pm    Post subject: One Cylinder on an M14 Running Hot?? Reply with quote

I think I understand now. You should be checking the valve clearances.
Dennis


On Wednesday, April 3, 2019, 5:37:14 PM EDT, fighterguy <deanandsteph2013(at)gmail.com> wrote:




--> M14PEngines-List message posted by: "fighterguy" <deanandsteph2013(at)gmail.com (deanandsteph2013(at)gmail.com)>

Hi Dennis,

I am not sure that is correct, and sorry if I am being dense but....

The #3 cylinder was indicating high to start with. So I swapped leads with #4 cylinder - put the #3 lead on #4 cylinder, and vice versa.  So....#3 INDICATION is reading #4 cylinder....and #4 INDICATION is reading #3 cylinder.

After the switch, #3 indication (#4 cylinder) was reading normal, and the #4 indication (#3 cylinder) was reading HIGH!

Smile

Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=488491#488491

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fighterguy



Joined: 11 Aug 2014
Posts: 17
Location: United States

PostPosted: Wed Apr 03, 2019 3:51 pm    Post subject: Re: One Cylinder on an M14 Running Hot?? Reply with quote

Thanks....will do that again, and re-trace my steps.
Cheers


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PostPosted: Wed Apr 03, 2019 4:15 pm    Post subject: One Cylinder on an M14 Running Hot?? Reply with quote

also a good idea to do a compression test and check for valve leaks. Listen carefully for valve leaks.

Dennis

On Wednesday, April 3, 2019, 7:53:47 PM EDT, fighterguy <deanandsteph2013(at)gmail.com> wrote:




--> M14PEngines-List message posted by: "fighterguy" <deanandsteph2013(at)gmail.com (deanandsteph2013(at)gmail.com)>

Thanks....will do that again, and re-trace my steps.

Cheers

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PostPosted: Wed Apr 03, 2019 6:41 pm    Post subject: One Cylinder on an M14 Running Hot?? Reply with quote

What is the type of cylinder head temp gauge for your 9 cylinder ?

[quote] --------


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