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oil temps

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airman(at)appledumplings.
Guest

Posted: Sat Aug 26, 2006 5:33 am Post subject: oil temps

I wrote a month ago about an oil temp issue.  This is an update.

I live near atlanta and I have a  1976 aa5b O-360 with 300 SMOH that  

I have owned since march.  Since the weather has warmed up my oil  

temps have been running about 1.5 to 2 needle widths from the red- 

line.  The things I have done to try to resolve this issue are:

I replaced baffle seals.

I fixed the inter cylinder baffles that were not wired together.

We just recently pulled the vernatherm and it looked to be seated  

correctly and operated as expected when we checked it.

We also checked the gauge. Unfortunately it seems to reading low not  

high! We are now checking the timing.

The only thing I can think of left is the Oil cooler. Which brings me  

to this question.



What are my options?  I think i am just going to go with a new oil  

cooler rather than re-condition. Are there any STC's for a larger  

cooler and if so can someone send me that info?  Have any of you guys  

had field approvals for a different cooler?

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Red_Horse(at)mchsi.com
Guest

Posted: Sun Aug 27, 2006 7:08 pm Post subject: oil temps

I have a similar problem.  I purchased '76 Cheetah two years ago and the

engine oil temp has never run near normal (180 degrees).  And lately, with

the added hot summer OAT (Huntsville, AL) , the engine oil temp has been

running 2 - 3 needle widths from Red Line. I had the engine overhauled with

the engine baffels and seals replaced at the same time. Having a 5 channel

engine monitor allows me to monitor all 4 cylinder head temps with No. 4

running the hottest. My CHT readings tell me that it's not a cooling problem

as the CHTs run consistently below 400 degrees, usually around 370 -390 in

cruise. I also have an ADC Eng Oil Filter system which eliminates changing

the oil filter. ADC adds say the added filter system and fins should aid in

cooling but I haven't noticed any difference.



After a long instrument training flight today where the oil temp was again

2 - 3 needle widths from red line, I took a long look under the cowling,

again checking the baffels, seals, ect. No problem there. I noticed a sharp

bend in the oil line from the engine to the oil cooler to the point I

believe the line to be crimped, thus possibly restricting oil flow. The only

other thing I can think of is the oil cooler. I believe it to be too small.

When Excel-Air overhauled my engine, John Jaardema (Sp) mentioned that I

could opt for a larger oil cooler with an additonal cooling vane; however, I

opted to keep the OEM oil cooler instead, probably not a good idea.



Anyway, I'm going to have my local maintenance folks take a look at it,

checking the temp bulb, baffels, etc. I'd appreciate any options or

solutions any may have.



George

N22BA

KMDQ Madison Co Executive Airport



---

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GrummanDude

Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

Posted: Sun Aug 27, 2006 11:26 pm Post subject: oil temps

What I have noticed, is that the condition of the fins make a big difference.   I also like the 8406 oil cooler although I don't think Fletcher's oil cooler STC's include this one.   Why not I can't say.   It isn't vacuum brazed like the Niagra oil coolers they recommend.   

 

 I also noticed a 15 degree decrease in oil temp (at an ambient of 115+ on the desert) when using the larger cooling air exit ramps that I have made to order.   

 

 Send me some really detailed pics of all of your baffling.   Let me see what you have.

 

 Thanks

 Gary  [quote][b]

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_________________
Gary
AuCountry Aviation
Home of Team Grumman

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