Help! INtake manifold bolt part number has changed
 

I just picked up an intake manifold bolt from the dealer to replace one that snapped. Part number for 2004 MT is 99794-0835. The part I got from the dealer has been superseded to 99794-0840.

The new part is longer with about 5 more teeth.

Since it threads into a pocket in the block, I am concerned whether there is really enough room for this longer bolt. Has anybody used this part successfully?

Given that I just got really lucky with an easy extraction of the bolt I snapped, I am not really excited about taking a chance of screwing things up by installing a bolt that is too long.

It won't break regardless unless you overtighten it again

Stick something down the hole and compare the depth length to the bolt

They wouldn't actually supersede it if it was not the proper fit ....

I didn't over tighten the one that broke in the first place unless you consider torquing to just under 20 on a bolt spec'd for 18.9 to be over tightening.

I did measure the depth and it is very borderline, which is why I asked the question.

The dealer said the part number has been superseded twice. I'm trying to determine how recent was the current part number change, and why is the size different? Maybe the size isn't different, but the wrong bolt is in the package? I don't know. That is what I am trying to find out. I have been trying to find spec's for the bolt part number to confirm I have the right bolt, but haven't found them so far.

The original bolt is 3.5cm including the washer. The replacement is 4cm without the washer. I didn't use calipers on the washer, but it looks about 1.5mm.

by pushing firmly on the manifold but with no bolts so no torque I measured the depth at 3.9cm. The new bolt came without a washer. Without a washer it looks like it won't fit.

I'm sure those measurements are not perfect, but based on them there is 0.5mm to spare BEFORE compressing the gasket. Are you really comfortable telling me that Mazda tolerances on the depth of the pocket, the thickness of the gasket, the depth of the manifold body and the length of the bolt all add up to something well less than 0.5mm?

Would it be too obvious to suggest that you stop by Lowes or Home Depot for some generic flat washers to space it out a bit if you think it's too close for your own comfort level.

Yes, stacking washers from Lowes sounds like a much better idea than using the right bolt.

I think the comment was directed to your seeming lack of common sense....

The original bolt broke when torquing it....not because it was corroded...so that would tend to indicate that it was torqued too much in a previous installation....or the bolt was a dud.

Measure the bolt...if it is too long then shorten it, either with a washer...or by actually cutting it down to size...it isn't rocket science. Mazda wouldn't supply a bolt that didn't work...usually different part numbers in bolts mean a change in suppliers..not a re-design..

Yes, I an fully aware that you both felt the need to reply not because you have any clue about the answer or had anything useful to add, but because you assume I am a complete idiot and couldnt resist. Thanks for that.

Even though the bolt has never been off the car before and broke under factory torque specs you apparently still feel that way.

I totally agree, which is why it is nonsensical to suggest cutting the bolt or stacking washers to make an oem bolt fit, and why I asked the question of whether this is the correct part.

I was hoping to hear from somebody with experience with this part, or maybe specs for the part to determine whether the right bolt was even delivered. I'm still interested if anybody knows the answer.

If you have no idea what the answer to my question is, then by all means continue to reply with more unfounded assumptions of my incompetence. Such fun.

If it was a new bolt...you are more likely to resemble the first description. ...if you think that we have nothing better to do than lookup a bolt part # you are delusional.

Learn to use a torque wrench...and quit wasting our time

Tried to be nice.....and civil...sometimes it isnt worth the effort

And learn how to read part numbers ...

9979 is bolt, 40 is what kind, 8 is grade and 35/40 is length.

The part number did change, but its not the end of the world, itsnapped because it was overtorque before, nothing more.

If u are not comfy with it, was it so hard to get a washer?

You have an interesting idea of nice and civil. If you have no idea the answer to a question, then feel free not to reply. Problem solved, no time wasted.

I didn't ask you to look up part numbers for me. I gave both numbers and asked if anybody had used the new part. You haven't. Great. You don't know when or why it changed. Great. Why then the need to write condescending responses about lack of common sense and inability to use a torque wrench based on your false assumptions? Is that you just being nice and civil?

Thanks. First reply that even remotely addressed the question asked. Of course I already know the part number is a bolt and I already know, and have given, the lengths.

The question is when and why did Mazda change the length, and has anybody used the longer bolt on a stock 2004.

I have not asked anybody to look up parts or do any work for me. If no one has used the part, fine. I don't get how such a simple question has generated so many snotty responses.

You don't think your other posts are relevant? Those of us that frequently try and help on here are more than intelligent enough to follow your other threads on this issue. I did respond and try to help on the other posts regarding your broken bolt.

If you cop an attitude.....you will get it back

If you ask stupid questions that aren't in the stupid question thread you will get responses in line with how stupid it was.

Of course, which is why you can't have been surprised that your condescending attitude and insults in your initial post was not warmly received. The fact that you chose to chime in with an insult even though you had nothing useful to add didn't give me a lot of patience for you.

My response was tamer then it could have been because I really do appreciate the experience and willingness of most here to share info to help keep these unique cars on the road.

Humor me: What was the stupid question?

Funny how you forgot to quote the most relevant part of my last post

Im not going to waste any more time on you. .. you clearly can handle it yourself

Previous post:
There. That is what I didn't quote because I wasn't responding to it. I believe you responded to me twice in previous threads, once about extracting a broken bolt and once about where the manual says to never reuse one of these bolts. Neither response had any sort of negative or condescending tone, and both opinions were very much appreciated. That actually made your post on this thread very weird in comparison.

I still have no clue why the question of whether anybody has used this new part on an intake manifold would set you off. I just don't get it, but i guess it doesn't really matter at this point.

According to Mazda it is the correct bolt. As our cars get older misc. parts will be superseded or even NLA. What will you do then? Become anally fixated and excessively argumentive while your car sits in a non-running condition? My washer suggestion was to help you get up and going again. You can look for another bolt and replace it later if you like. How does the engine know if there is an extra washer or two? Otherwise, if you want to argue the point, why not do it with the person who sold you the bolt instead?

Maybe DIY automotive work is not for you, or forum posting either .... :rolleyes:

Where does the bolt go you are trying to replace. Why don't you just swap it with another one that has a open hole instead of a pocket?