Does your C180 cylinder baffle look like this?
- Thread starter sj
- Start date
behindpropellers
Registered User
NE Ohio
Mount looks great but is the saftey wire missing from that bolt 
Gordon Misch
MEMBER
Toledo, Wa (KTDO)
And type "A" screw in tinnerman nut.8)
sj
Staff member
Northwest Arkansas
They fall right out! I have a pile of tinnermans, just need to replace it I suppose...
Gordon Misch
MEMBER
Toledo, Wa (KTDO)
SJ, I was just giving you a rash, because I know I read somewhere that Tinnerman nuts require type B screws, due to difference in thread pitch and very slight difference in root diameter between type A and type B. In my experience the type B screws seem to hold better.
The Specification Chart part of this page https://www.aircraftspruce.com/catalog/hapages/tinnerman2.php?clickkey=5485 indicates type B.
However, page 68 in this pdf seems to permit either. https://spaenaur.com/wp-content/uploads/2018/02/Tinnerman-Products-C67-C101.pdf
So now I'm confused. Can you pros out there set me straight (with certainty, rather than just opinion)?
The Specification Chart part of this page https://www.aircraftspruce.com/catalog/hapages/tinnerman2.php?clickkey=5485 indicates type B.
However, page 68 in this pdf seems to permit either. https://spaenaur.com/wp-content/uploads/2018/02/Tinnerman-Products-C67-C101.pdf
So now I'm confused. Can you pros out there set me straight (with certainty, rather than just opinion)?
Alex Clark
Registered User
Life Long Alaskan
What about #6? I've had 3 or 4 versions of a plate over #6, also because Steve K. suggested it.
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WhiskeyMike
MEMBER
West Boxford MA
I had an O-520 in an L-19 Bird Dog and could never figure out why???? they put the oil cooler in front of the cylinders, blocking the cooling air, and perhaps pre-heating the air going over the cylinders? Am I just being stupid, or was this a bad idea? 
The cooler doesn't block any air. There's a baffle behind the cooler to prevent air from going down in front of #5. The cooling of #5 comes from the pressure cowl doing it's job. Ram air to an exposed head isn't very important judging by how both my front cylinders are blocked and I have really even temps as a result. The dam in front of #6 improves the cooling of #4 in my engine. Maybe I'll pull the shroud on #5 and see if the temp distribution changes. Naw, too much work. It's been a journey to get my temps where they are. I'm not messing with it.
The question remains, does the #5 shroud increase or decrease the CHT at #5?
The question remains, does the #5 shroud increase or decrease the CHT at #5?
The SB discusses this. Don't have the # handy right now, but they are available free on Cessna's site.
