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  #1  
Old 10-24-2015, 03:31 PM
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617 N/A Piston needed ASAP!

I am in need of a 617 N/A piston for the engine I have been working on for the past few months http://www.peachparts.com/shopforum/diesel-discussion/369253-om617-n-main-bearing-problem-im-baffled.html (last post). I put a piston in, but the vibration is such that it is not acceptable. It seems that the piston I put in is a little different, and has a different weight than the other four. I won't make this mistake again, and will weigh the piston that I put in, and compare it to the old one. I hope the replacement piston is a little heavier, or the same weight. Lighter would not be good. Photo attached of the correct piston top. If you have one, please PM me with a price with shipping. Thanks, Rich

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  #2  
Old 10-24-2015, 05:14 PM
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Oh wow I can almost feel the stress from here!

Thread #3!

From the original =>

Quote:
Originally Posted by Stretch View Post
You need to specify (in your ad) the required piston size and the weight if that is important to you!

######

I have some questions

1) How heavy is the new piston - how heavy is the old - what's the difference in weight?

The book says max 10g on a "worn" engine - max 5g for new (Chap 03-316)

2) When you fitted the new piston did you replace the rings with new?

3) Did you hone the cylinder walls before fitting?

4) Have you done a compression test - if so did you piss about tipping oil down the cylinder bores?
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  #3  
Old 10-24-2015, 06:51 PM
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  #4  
Old 10-24-2015, 07:04 PM
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Do you know the Group....
and the version of that group..
is it for the number one hole .... or 2-5 ... which are different sizes....
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  #5  
Old 10-25-2015, 02:09 AM
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Quote:
Originally Posted by leathermang View Post
Do you know the Group....
and the version of that group..
is it for the number one hole .... or 2-5 ... which are different sizes....
I do know it is #2, and the piston I put in was from #2 of the parts engine. I also know the head of the piston is different. That is why I posted a photo. I think the head being different is the reason it is a different weight than the original. Also, I used the rod and piston together, and should have just used the replacement piston and the original rod. I plan to use the original rod and hopefully get a piston that is the same in design and weight. I do know that there are at least three different designs. I will get a photo of the other design soon, it is quite different around the pin and skirt bottom.
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  #6  
Old 10-26-2015, 06:01 PM
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Better photo

Here is a better photo
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  #7  
Old 10-26-2015, 07:41 PM
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I'll see what I can locate... I have a couple sources locally that might have one.
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Old 10-26-2015, 08:01 PM
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Quote:
Originally Posted by capflya View Post
I'll see what I can locate... I have a couple sources locally that might have one.
Thanks, and please let me know...Rich
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  #9  
Old 10-26-2015, 09:07 PM
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Don't yall need to be sharing weights ?
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  #10  
Old 10-26-2015, 09:11 PM
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Quote:
Originally Posted by leathermang View Post
Don't yall need to be sharing weights ?
As soon as I get the bad piston weighed, I will have a weight. It won't do any good to know the weight if all anyone has is one with the wrong top design. It will be a different weight for sure, if not the same top. Been there, done that.
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  #11  
Old 10-26-2015, 09:42 PM
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Okay, I got the rod off and the bare piston weighs 1lb, 8.6 oz on my postal scale.
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  #12  
Old 10-26-2015, 10:34 PM
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Can you just lighten pistons to match? I'm sure there is a reason you can't, but just curious.
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  #13  
Old 10-27-2015, 12:03 AM
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Quote:
Originally Posted by Jooseppi Luna View Post
Can you just lighten pistons to match? I'm sure there is a reason you can't, but just curious.
If I had a piston with the correct top, and it was heavier than the bad piston, then yes I would lighten it to 1lb 8.6 ounces.
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  #14  
Old 11-02-2015, 04:05 PM
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Piston weights

I got the piston out and weighed it. It weighs 1lb 8.7 oz. Just .1 oz more than the original one. I have yet to weigh the rod, so that may determine how much more or less the entire assembly is. If it is real close, I can only assume the vibration was from lack of compression in that cylinder from using the old rings....Rich
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  #15  
Old 11-02-2015, 04:08 PM
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So that's a difference of 3 grams?

Well within the FSM specifications

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1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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