Bolt size - R380 to 3.9l? - Defender Source
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  #1  
Old March 9th, 2015, 01:03 AM
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Bolt size - R380 to 3.9l?

This R380 and the 3.9l were not attached when I sourced them so I don't have the original bolts between the two. I am getting ready to put the 3.9l on an engine stand and I thought I needed 3/8" bolts...but acouple just won't fit. Almost seems like there are two different bolt sizes going into he 3.9l. Is this right or am I dealing with some mangled threads?
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Old March 9th, 2015, 07:18 AM
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I can check tonight when I get home but I think they are m10x150
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Old March 9th, 2015, 07:50 AM
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Second thought I think those are m8 1.25
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Old March 9th, 2015, 09:46 AM
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Many thanks...of course metric.....and I bet you are correct about the m8 1.25. The m10 1.25 I tried to fit wasn't going to work at all.


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Second thought I think those are m8 1.25
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Old March 9th, 2015, 11:55 AM
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Ugh....m8 1.25 is loose and doesn't tighten down. I may have a slight issue....as 3/8 really fits (without forcing it) in two of the holes. And the other holes' threads look to be the same as 3/8 16 but slightly smaller. I am assuming all these are supposed to be the same, right?
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Old March 9th, 2015, 12:09 PM
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3/8th x 2" UNC
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Old March 9th, 2015, 12:47 PM
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So that is what they are supposed to be? Or tap them so they are all that size?

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3/8th x 2" UNC
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Old March 9th, 2015, 12:49 PM
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The book calls for 8 of them in that size
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Old March 9th, 2015, 12:57 PM
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Hmmm....ok. Wonder what I have going on here then. It really looks like a 16 thread as well.

Looks like I just need to add a little force to see what happens.

Thanks!


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The book calls for 8 of them in that size
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Old March 9th, 2015, 04:34 PM
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cant hurt to clean out the hole and run a tap through it.
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Old March 9th, 2015, 06:46 PM
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Whatever Zach said. He provided one for me that I snapped off in the block. Yes, i'd run a tap in there to clean out the years of gunk.
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Old March 9th, 2015, 06:55 PM
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I think that will be the remedy. Thanks.
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cant hurt to clean out the hole and run a tap through it.
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Old March 9th, 2015, 11:54 PM
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Cleaned out 3 mud dauber nests and tapped the rest. 3/8 16 thread bolts work perfectly. Thanks all!
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