Club Homepage Forums Classified Ads Buy & Sell - Everything But Airplanes WTB 152 Oil temp gauge and/or sender

Looks like my plane has the older Stewart Warner gauge and I am getting a high temp indication and the only thing I can find as far as a sender p/n (assuming that is the issue) is to upgrade to SK152-23.

Im assuming this kit contained the Rochester gauge and sender but can seem to find any info on it. Anyone else have any idea? The manual calls for these as updated;

Gauge P/N C669564-0101
Sender P/N S2335-1

I've verified the actual temp with a different gauge and its running right at 190. I've looked into the EDM and JPI options but don't have any room in the panel. If I have too Ill remove the ADF but figure I try going this route first.

P.S. Thanks Hung and Scott Keating for all the prior research you've done and posted on the forum here

Chad, testing the sender should be easy.
In the service manual there is a chart (table 1 on page 15-25)that list resistance values for certain temps.

The sender you say you have (pn S2335-1) should read 990 ohms at 72 deg F.
and 34 ohms at 250 deg F.
I would take these measurements with the temp guage disconnected.

Keep in mind that there are 5 different senders that were used on the 152s and they all have different resistances at
different temps.
Be sure you have the correct sender.

Thanks for the info. My manual is older and doesn't seem to have that info.

The actual gauge in my aircraft is a C669512-0102 and the sender didn't appear to have any useful P/Ns on it. Although, I was just looking at the Aircraft Spruce site and they sell a non certified one P/N 3080-37; my sender does have 3080 stamped on it but with a 55 under it? I'm guessing someone put the wrong sender in for this particular gauge. The aircraft is relatively new to me. I noticed it was high on the test flight but pressure looked good so figured it was just a gauge error.

I did test the sender on the stove in veg oil with a Fluke meter temp probe as the ref and it seemed to be down in the high 20's at 250. I saw the 34 ohm spec somewhere else on this forum as well. I think my problem is going to be getting the correct sender for this gauge.

Looks like the original sender would have bee S1630-1 per the wiring diagram in the service manual. According to a different thread I found on here, looks like OHM's for that should be 52.4

I replaced the Cessna oil temp gauge/sender in my plane with a Westach unit [chiefaircraft.com] . Attached is a picture of the old sender (bottom one). I'll check and see if I still have it at the hangar and if it has any marking. You can have it if I find it.

Thanks Hung

Since I found the original sender P/N for my gauge in the wiring diagram, I may not be needing new gauge. Looks like there are a few places that have these senders available so I will do some calling around tomorrow and see if I can snag one. Until this point, I wasn't able to confirm what p/n sender I actually needed so was thinking I would just upgrade to what my IPC calls for. Still curious what Cessna kit SK152-23 consisted of

Attached is a copy of Table 1 from the service manual I have on disk.
It shows 46.4 ohms at 220 deg F.

Searched through my hangar and couldn't find the old temp sender. Last time I saw it was in 2007. I might have given it to someone else.

Thanks for looking and the generous offer. I ended up finding a new sender on eBay of all places and have it on the way; although after seeing the chart Ron posted I'm wondering if the old one is really off since I was testing it at 250...guess that's what happens when you use a manual almost as old as the airplane. I'll throw the new one in when it comes in later this week and see what happens.

Looks like the sender wasn't the issue. I installed the new one and its still reading high. I think Im going to pull the gauge and send it with the new sender up to Wolfs. I like the idea of going after market but I really don't have any where to put it and it would annoy me to see the stock gauge with an inop sticker on it.