Changed my oil today...

davidyan · 08-10-2009, 01:54 PM

They all have the crush washer unless the last person who did your change didnt put one on. Sometimes they almost seize on. You have to take it out with a very fine tipped flathead screwdriver.

kannibul · 08-10-2009, 03:16 PM

Quote:

Originally Posted by davidyan

They all have the crush washer unless the last person who did your change didnt put one on. Sometimes they almost seize on. You have to take it out with a very fine tipped flathead screwdriver.

So the bottom of the oil pan bolt is flat/smooth?

I'll check when I hit 3750 miles...I figure it'll be fine - there should be enough torque on the threads, and compression on everything to keep things tight enough to not leak any oil.

davidyan · 08-10-2009, 09:55 PM

Quote:

Originally Posted by kannibul

So the bottom of the oil pan bolt is flat/smooth?

I'll check when I hit 3750 miles...I figure it'll be fine - there should be enough torque on the threads, and compression on everything to keep things tight enough to not leak any oil.

Yes, it can be difficult to see the crush washer. You're right that it should be tight enough though assuming you used the right amount of torque. Once the washer is crushed (which it should be), it can almost seize on and will take some prying to get loose.

kannibul · 08-11-2009, 08:09 AM

Quote:

Originally Posted by davidyan

Yes, it can be difficult to see the crush washer. You're right that it should be tight enough though assuming you used the right amount of torque. Once the washer is crushed (which it should be), it can almost seize on and will take some prying to get loose.

OK, I still have one more point/question on it...

Looking from the threaded end towards the head - in my case, there is a ring around the threaded portion, that has approximately a 1mm gap all the way around - this in turn has a about a 1mm rise, a 1mm width, then a 1mm drop, then the remainder of the bolt head.

On top of that, the outside of this area I've described also has black paint on it...as if it's part of the bolt. This in combination with it being centered (unlike a washer which generally will not center and seize), leads me to believe that it's part of the bolt, and not a seperate crush washer, however, it also makes sense that it's not a crush washer, as I've not seen a bolt that has something like this. Lastly, regarding not a crush washer, the crush washers I'm familiar with are aluminum, and tend to be the same size as the bolt head...

If I take a hammer to it, and it is part of the bolt...well, I just damaged the landing surface of my oil pan bolt and it'll potentially leak.

Maybe it's worth a call to Nissan to verify that ALL 370z's come with an oil pan bolt that have a crush washer.

Modshack · 08-11-2009, 12:37 PM

Quote:

Originally Posted by kannibul

Looking from the threaded end towards the head - in my case, there is a ring around the threaded portion, that has approximately a 1mm gap all the way around - this in turn has a about a 1mm rise, a 1mm width, then a 1mm drop, then the remainder of the bolt head.

.

This would be a "Crush Washer". Quit obsessing about this. I've had 57 cars and only replaced crush washers when the parts guy taped one to the filter box (rare). never had a leak.

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08-10-2009, 01:54 PM	#1 (permalink)
davidyan Base Member Join Date: Jun 2009 Location: CA Posts: 244 Drives: PG 370Z Sport 6MT Rep Power: 16	They all have the crush washer unless the last person who did your change didnt put one on. Sometimes they almost seize on. You have to take it out with a very fine tipped flathead screwdriver.