Maybe a slim chance someone knows the length of these WP bolts off hand, but I'll give it a shot. The shop that replaced the pump last time put in different bolts. No leaks, but I thought I would get them right length this time. I have the special WP bolt that is M8-1.25 x 30 mm (measured from the underside of the head, so I am assuming the others are 35 mm length also since the thread depth on the hole in the block are the same.

 

There are 3 different part # for the WP bolts, so those on your car are probably correct.

08120-83028

21012-v5011

21012-v5001

 

Thanks for the info. Where did you find this on the parts diagram? Most of the online dealer parts show a very basic diagram with no bolts.

Its is strange the other regular bolt ( not the WP bolt) is that different from the other four. It's is 5 mm shorter and has no large flange washer. Unless I am missing something, the hole depths in the block are all the same. I'll have to re-check -Inquiring minds want to know.

 

The bolts are all the same except that one @ 2 O'clock....

 

Cmax, thanks for the great pics! Based on alllw86 post, I've done some digging and it does look like on the earlier VG30s had three different bolts rather than just two on the later VG30s. The info is sketchy, since I can't find the bolt sizes in the online data bases. The different bolt is 30mm single washer one position counter clockwise (at 4 o'clock) from the cover bolt at 2 o'clock you mentioned. The other bolts are 35 mm long and have both a lock and a larger flat washer. The 30 mm bolt had only a lock washer, so it looks like it is the wrong bolt, but it probably isn't. The only reason I can think this bolt is used is to clear the timing cover and the length has nothing to do with the assembly.

When I removed this 30 mm bolt is was in the 8 o'clock position and this adds to the confusion. All the hole depths in the block are the same. So, maybe it's to clear the timing cover, since the 30 mm has a smaller head height and no washer. All the bolts are M8- 1.25.

I think I am going to try a dry fit of the WP and timing cover to see if this confirms anything.

You will need to zoom in on your browser to see this diagram below. I looked closer at my factory manual, and it does show some very minor differences in the three bolts.

http://www.nissanpartszone.com/Page_...ponentsIndex=2

 

I think I found the answer, here's is my thought. The 3rd different bolt in the early VG30s should be in the 4 o'clock position to allow extra clearance for the t-belt. The t-belt cover had no clearance problems. That bolt comes pretty close to the t-belt especially with belt vibration or if it becomes the slightest bit loose. Clearance is from 8 mm with the large head 35mm bolt to 11 mm with the short head 30 mm bolt (.315 to .433 "). In the later VG30 it looks like five of the bolts were changed (except the t-belt cover bolt) to shorter head bolts that allow extra clearance and eliminate the need for an extra 3rd bolt. These revised bolts have flat washer reducing the t-belt clearance some are probably the bolts in Cmax's post above.

 

Those part numbers on the WP bolts I listed were from my Nissan Maxima Parts Catalog (Pub. No. C-0530U) I got off of eBay years ago. The drawings are basic, 3 bolts are shown , doesn't show all the bolt placement so you are still guessing on their clocking. No info on what size they are. Not that $$$ so you could order them from your local dealer to ease your mind a little bit.

Are you also replacing the timing belt at this time? If due within 10k miles I would do that now.

 

I was able to get the bolt clock positions from both Nissan Diagram, Alldata and my factory manual They all agree based on the looks of the bolts, what I can piece together from the p/n of the bolts and my theory of why the smaller bolt is located near the t-belt.

Yep, I am doing the timing belt as well.

The other question is to replace the tensioner stud with the PIA to change it out, or worse risk snapping it. The stud looks in great shape, no rust and is square to the block (not bent) using my machinist square. Given the low miles on this car, I think I'll leave it.