IP Belt Tensioner

[dieseldorf]

[begin edit 06Jul2014 ALS

I'm slipping this in at the beginning of Chris' thread, so you don't have to read four pages of posts to get the summary, which is: the LD28 injection pump belt tensioner hasn't been available from Nissan for several years. The bearing in them does wear out and get sloppy, and if you use it long enough, it can take out your belt. The good news is that I am set up to rebuild the tensioner, installing a new, welded axle shaft that supports a double-row quality SKF bearing that is not only "lifetime" rated for this application, but can be replaced if you ever thought you needed to. There's a lot of discussion in this thread, and I've included pictures & dimensions if you care to read on, but if you just want to buy a replacement belt tensioner . . .

Click HERE for larger


The price was $160 + $20 core in 2007, and remains the same in Jul2014. Contact me via email (yes, that means you have to register to be a member of this forum).

Al
[end edit]

[edit 01Feb2019 ALS

Too many cores came back to me with bent or rusty pulleys: I am out of cores, so I can only rebuild your core.

[edit 12Jul2019 ALS]

I'm thinking about having replacement pulleys fabricated. See this post.

I do still have plenty of SKF bearings and custom axles.

Hey Guys,
I am in the process of replacing the timing chain/gears and IP timing belt.
I have all the parts except the belt tensioner pulley.
I could not locate it anywhere. No parts store has even the part number.
Can someone direct me to a source and/or provide the part #??
Thanks

[goglio704]

16805-V0700 at Nismoparts.com

[dieseldorf]

Thank you Matt.

[asavage]

Can someone direct me to a source and/or provide the part #?

It's in the FAQ, IP Belt Section.

AFAIK, there is no aftermarket source. A couple of us have stashed old ones, and if they become either expensive or unavailable, I can have a new axle machined and replace the brg within the tensioner directly. Until then, it's cheapest to buy it from Nissan.

[dieseldorf]

I ordered at nismoparts.com and got this email:

Thanks for the order! The part you have ordered is no longer available through Nissan. Your order has been canceled and your card was never charged.

If you have any questions concerns please e-mail me back or give me a call @888-449-5131.

Thanks,

Shea Merritt
http://www.nismoparts.com
Your #1 Online Nismo Source!!

[asavage]

That is correct, according to my "local" Nissan parts guy. He says he sees several on backorder, but they've been on B/O for months, which usually means NLA.

So, I'll carry mine down to the machine shop and get some axles made. Or does someone else want to make a run of them?

[83_maxima]

I ordered at nismoparts.com and got this email:

Thanks for the order! The part you have ordered is no longer available
through
Nissan. Your order has been canceled and your card was never charged.
If you
have any questions concerns please e-mail me back or give me a call
@888-449-
5131.

Thanks,

Shea Merritt
http://www.nismoparts.com
Your #1 Online Nismo Source!!

Wow, I just ordered one from them the month before last and received it post haste.

I wonder what else is slowly becoming NLA...

This is what I received from Nismo parts dot com.



I am assuming that this is the correct part.

[asavage]

That is the correct part. I just carved mine up today, took measurements and pictures. I am not going to be able to rework this as I thought, but there are several ways to skin this particular cat. I want a good balance of ease of fabrication, durability (the 6203 brg Nissan uses is not a good first choice), future serviceability, and cost.

Ideas I have so far are include:

• Fab completely from scratch (reusing base bracket). 2.375 cold-rolled stock, shouldered bore roller (shoulder to outside), snap ring groove to inside, stepped axle, axle interiour thread and retaining washer.
• Reuse roller shell, use dbl-row ball brg instead of single-row 6203 -- there is plenty of room. Axle retention TBD. Continue to use interference fit to shell.
• Use tensioner roller & brg from some other existing application -- roller OD does not need to match exactly, +-0.5" probably OK. Custom axle needed.

Ben, don't toss your old tensioner. I'm going to need cores.



The OEM setup has the axle being the inner race; it is not a separate piece. This is not all that unusual, but it does complicate replacement. As supplied, it has very different heat treat from one end to the other.

That number on the inner seal, "6203LU" is a generic designation and does not spec the integral shaft.

[goglio704]

2 points...

1. Nismoparts.com can be a little quick on the trigger about calling something NLA. If there is not currently one in the US, it is NLA as far as they are concerned.

2. Al, count me in if you go to get these produced.

[asavage]

I put a couple hours in, have some more ideas. I'll try to keep it in front, but I have a lot of irons in the fire, so don't expect results for weeks, rather than days.

My "local" Nissan dealer confirms somewhat that it's NLA.

[goglio704]

Al, I figured this would take some time, I've been looking at it too. The timing belt area of my spare engine is wide open. If you need any dimensional data, let me know. Have you considered using a shoulder screw for the axle?

Later...

So much for the shoulder screw (bolt) idea. 17 mm ID is the likely ID of a replacement bearing. Shoulder screws are not typically available with that shoulder OD.

[goglio704]

I found a company in Taiwan which claims to offer an LD28 timing belt tensioner. I have contacted them by email. I'll post results if and when I get them. Their part number is BT-10528.

http://www.automotivebearings.net/

[asavage]

I sent pictures and dimensional data to an online supplier of NTN brgs, but they said they don't offer NTN brgs with integral shafts, period.

Strangely, I have a Ford 2.3l cam belt tensioner here that also has a 6203 with an integral shaft (though obviously a different shaft). Somebody is buying these brgs. Cheapest would be to be able to buy a couple dozen of them, then figure out how to attach them to the plate.

If that doesn't pan out, then a double-row ball brg on a custom axle with retaining nut or similar would be my next choice, salvaging the OEM roller. A double-row brg would be a lifetime brg in this application, which is attractive.

If all else fails, I can make the roller too. That tends to drive the price up considerably though, unless you can get an enthusiast to turn them out.

[goglio704]

I ordered one. It was $15 for the part and $25 for shipping. They take Paypal. I'll let everybody know how it works out.

[davehoos]

as normal its the cost of shipping small numbers.
thats not over the top.these things are normally sold as a kit.

CD IP belt uses the same bearing [6203LU] idea but bolts on with a 8 mm bolt as an exentric.it uses a loose wound spring to tension it.


it uses a 20 mm belt.has about 25 mm of belt surface area.has a lip on engine side.is 60 mm dia.identical to look at in photo.bearing od is 40 mm.

from bearing to engine surface is 10mm [10+12=22mm] from pulley lip to engine 5 mm[this may be a problem].total hieght siting on table is 33mm.

another option is a nissan CA timing belt tensioner.its the same idea but the slotted hole may not be in the right area or the belt might not line up.