390 or 360
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Freshman User
Joined: Sep 2002
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From: Nanaimo Canada
390 or 360
Hi all,
I know this topic has been cover in great detail but here is a new angle (i think). I broke a connecting rod in my '360' . After I pulled it appart I discovered 390 stamped on the side of the piston. Has someone converted this '360' to a 390?. I know I could tell for sure by measuring the bore or comparing the connecting rod to 390 or 360 but is a 390 piston marked?.
Thanks for any replies
Cies
I know this topic has been cover in great detail but here is a new angle (i think). I broke a connecting rod in my '360' . After I pulled it appart I discovered 390 stamped on the side of the piston. Has someone converted this '360' to a 390?. I know I could tell for sure by measuring the bore or comparing the connecting rod to 390 or 360 but is a 390 piston marked?.
Thanks for any replies
Cies
Thread Starter
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Freshman User
Joined: Sep 2002
Posts: 49
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From: Nanaimo Canada
360 or 390
Thanks for the replies guys, but the question is solved. Its a 390 ... the reason I know is that it broke a connecting rod. I took it apart and discovered that it had fully floating pistons; therefore it’s a 390. Lucky for me it broke the rod close to the crank and did little real damage before I shut it down. The 390 is now temporarily repaired and I will replace it with a rebuilt one after the winter.
Cies
Cies
Fleet Mechanic
Joined: Jul 1999
Posts: 1,360
Likes: 1
From: Iowa
By "fully floating pistons", do you mean that the piston pin freely slides into the piston rather than being pressed on? All FE's used a free floating piston pin that was retained by clips in the pistons. The only way to determine the difference from a 360 and a 390 is to find the crankshaft casting number, or measure the stroke.
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Freshman User
Joined: Sep 2002
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From: Nanaimo Canada
news to me
Hi 390fe
Yes, I did mean "the piston pin freely slides into the piston rather than being pressed on". Guess I have learned more about FE's. Always thought this was one difference between the 360 and 390.
I did replace the connecting rod with one from a 390, after comparing lengths (best I could with the broken one). I hope there is a big enough difference to tell by eyeballing. However the beast runs, but like I said it is tired and due for some replacement.
Cies
Yes, I did mean "the piston pin freely slides into the piston rather than being pressed on". Guess I have learned more about FE's. Always thought this was one difference between the 360 and 390.
I did replace the connecting rod with one from a 390, after comparing lengths (best I could with the broken one). I hope there is a big enough difference to tell by eyeballing. However the beast runs, but like I said it is tired and due for some replacement.
Cies
Fleet Mechanic
Joined: Jul 1999
Posts: 1,360
Likes: 1
From: Iowa
The rod lengths are different and visible to the eye.
"Guess I have learned more about FE's"
I learn stuff about these old dinosaurs every week. That's why I love FE's so much! Now go git another 390 to rebuild while you drive this one. :-)
"Guess I have learned more about FE's"
I learn stuff about these old dinosaurs every week. That's why I love FE's so much! Now go git another 390 to rebuild while you drive this one. :-)
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