Lee Smith Posted January 13 Share Posted January 13 I noticed that my 2004 Signature radiator cap is in need of replacement. I called REV Parts which has the ability to look up older parts. I got transferred to their Washington State office and placed an order for the part they looked up. It turns out that they do not have parts diagrams but work off a photo system. Interesting but apparently works. They sent me a Motorad 16 psi cap. The existing one on my radiator/coolant recovery tank has a "F3" stamp on it. According to my research, the "F3" cap is only 4 psi. I have heard mechanical cautions that it is very important to use the correct psi cap. If you have a Signature with a Detroit 60 engine, please look at your cap and let me know what is stamped on the cap. As a note, it does appear that this may be called a "coolant recovery cap" but the Signature with a Detroit 60 engine has a pressurized aluminum tank for the radiator fluid. Below are pictures of the Motorad 16 psi cap and the F3 4 psi cap. Thank you very much for your help. Lee Smith Link to comment Share on other sites More sharing options...
ktloah Posted January 13 Share Posted January 13 (edited) Lee, did you try a heavy truck supply store or a NAPA? The series 60 Detroit is quite common in over the road trucks... Edited January 13 by ktloah 1 Link to comment Share on other sites More sharing options...
Jdw12345 Posted January 13 Share Posted January 13 Somewhere in the owners manual it should say what’s required. 1 Link to comment Share on other sites More sharing options...
Lee Smith Posted January 13 Author Share Posted January 13 My manual does not list a cap. My local NAPA cannot find one. I was able to verify on the verulinks website that the 16 psi motorad is listed for the 2004 Signature. I am now comfortable with the 16 psi cap. Maybe the F3 was a substitute somewhere along the line. I do hope someone with a series 60 diesel can give me a final verification. Link to comment Share on other sites More sharing options...
Yoaks5 Posted January 13 Share Posted January 13 I found this in my manual. I can't find any mention on the cap psi but the picture in my owners manual is labeled 13psi. 1 Link to comment Share on other sites More sharing options...
Solution willbo777 Posted January 13 Solution Share Posted January 13 My DD Series 60 has a 16# cap on it. I would think you could get it most places like NAPA, etc. 1 Link to comment Share on other sites More sharing options...
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