MBMB

Not AFAIK. Just different pages of PET5. My pic was from the water pump diagram; SteveCo's was from the tensioner diagram (I think).

SteveCo

MBMB is correct...mine was the tensioner page...Tony's was from the water pump one. I used the '87 section in PET, FWIIW...not sure if all MYs have the brace.

As mentioned by someone else, I would definitely consider replacing the idler brace when you reassemble. Anything connected to the TB system is worth the effort to make sure it is working correctly. The risk cost of not doing so is way too high.

One possible reason the brace was not re-installed on your car might be due to the hex head bolt used to attach the idler. This would not have worked with the brace installed (countersunk hole...hex head bolt) If the socket head cap screw was lost/damaged and only a hex head was available for replacement...well, the brace was just added weight anyway! Just a theory...but stranger things have happened before!

Regards,
SteveCo in St. John's

MBMB

I used the '89 section in PET, but just checked the '87 section, and the '87 waterpump (illustration 105-00) has the brace too.

928 105 564 00 is the bracket part number.

900 249 008 02 is the screw part number.

You'll also need the screws to hold the bracket to the WP.

Mark.

N.Masco

thanks guys,

I'll call in an order today!

SteveCo

The bracket is actually called "water pump support", so we may have this backwards! I think it is worth something like $10. The screw is, well, screw-priced at a buck or two.

You might want to run down all the bits and pices that you need to attach this, as previously mentioned...can't imagine all the parts will cost more that $20. I'm sure any of the Big 3 can help on this.

Regards,
SteveCo in St. John's

doug928

I am in the middle of my TB change and I don't remember seeing that bracket either...anyone know of its purpose other than to support the tension roller? is it important and should I now order one?

MBMB

It looks to me like it's intended to stabilize the tensioner roller spindle (no way it supports the water pump). It's probably over-engineered (Neil seems to have gotten along fine for some time without it), but I wouldn't leave it out.

Another possible purpose occurred to me -- if you use a washer and screw to hold the tensioner roller arm on the spindle, the movement of the arm has a chance, over time, of unscrewing either the spindle (where it screws into the block) or the screw (where it screws into the spindle). With the "water pump support" at the front end of the spindle and the block at the rear end, there's less chance of something coming unscrewed.

Mark.

heinrich

I do not think my '85 has the bracket. I am mid-tbelt job. Should I try retrofitting it? Mine has a regulat hex bolt there too. No slot. Has had only one tbelt change in its life.

MBMB

I vote "yes."

Garth S

Heinrich/Mark,
Allow me a 'no' vote on this one.
The 'orriginal' water pump with a boss cast on the body as the pivot point for the carrier arm was used through MY '86.5.
Beginning with the S4, the boss on the pump was replaced with a threaded hole, into which is screwed the 12mm pivot stud (#11 in Steve's diag.) - and the cross brace (#11 in Mark's diag.), which also seems to function as a retainer for the carrier arm.
IMHO, the cross brace should be fitted to all later 'S4' style pumps. Prior to that, the existing brace would not fit, as a 12mm bolt vs. stud is used as the pivot.
With a bit of fabrication, a cross brace could be made and fitted to the pivot bolt head of the earlier cars - as a new design exercise.....

918-S

This must have been an upgrade at one point. I have a 1980 engine. It's not on mine.

heinrich

... I have decided to not do it, because Garth correctly points out, the replacement pump I have has the boss. Also, looking at the '85 Technik Manual that Big Dave so kindly helped me obtain ... there clearly isn't a brace ... which, in light of Garth's post, is superfluous info .... so. I'm going to go with the no-brace (commando) approach and let my '85's t-belt cajones blow in the wind, so to speak ...

MBMB

Good information, Garth. Thanks.