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Unread 10-17-2013, 06:57 PM   #1
poke_53
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Bolt and Washer Question

Ok in a previous thread I asked about a popping noise in my front end. I have narrowed it down to the track bar bolt and the LCA front bolts considering from what I have read. I have decided to weld washers on the mounting brackets to take up the slack. I don't have the option of making a new mounting plate or bracket so I have to go with washers. These are factory bolts and from what I have read they are m14 for the LCA and the track bar bolt is m10. Ive looked up specs on the bolts and washer and this is what I have come up with.

LCA bolt M14 has OD of 13.73mm
Track bar bolt M10 has OD of 9.78mm

Washers for the bolts listed above
M14 washer ID is 15mm
M10 washer ID is 10.5mm

So what I am looking at is:

1.27mm difference on the M14 = .635mm on each side or 1/40th ish
.72mm difference on the M10 = .36mm on each side or 1/64th ish

Now my question is when I weld these to the brackets are these tolerances too large for what I want to do with it?

Thanks for the help


Last edited by poke_53; 10-17-2013 at 08:20 PM..
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Unread 10-17-2013, 07:54 PM   #2
CCKen
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Go to a hardware store that has a large selection of washers and bolts. Fish through the SAE Grade 8 washers and see if you can find a washer that will fit with closer tolerances. Same with the Metric washers. Some time by going down in size you can find the right washer.

The other day I bought some Grade 8 5/16" bolts and washers. The 5/16" washer holes were too big for my liking. I found that the Grade 8 1/4" washers fit perfectly on the 5/16" bolt.

If you find a Grade 8 washer that is a hair tool small, you may have to ream or drill the hole out to size.
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Unread 10-17-2013, 09:46 PM   #3
wgirvine
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Where are you... Arkansas? Ok, just this once... because I'm feeling generous and I want to try out my new boring bar... What OD do you want and how many of each? I'll make them for you on my lathe.
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Unread 10-17-2013, 09:50 PM   #4
poke_53
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I really appreciate the offer but this is a project I am going to do this weekend.

Last edited by poke_53; 10-17-2013 at 10:02 PM..
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Unread 10-17-2013, 10:04 PM   #5
wgirvine
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In that case, yeah... try to make the washers a fairly snug fit on the bolts.
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Unread 10-18-2013, 12:57 AM   #6
Timo_90xj
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Quote:
Originally Posted by poke_53 View Post
Now my question is when I weld these to the brackets are these tolerances too large for what I want to do with it?

Thanks for the help
For the LCA bolts, try using SAE Grade 8 bolts with a 14mm metric washer (if you even need the washers welded to the brackets). If the bolt holes have not wallowed out, the SAE bolts are a little tighter fit on the holes compared to metric.

9/16" = 14,29mm.

On the trackbar, you're better off with a metric nolt, but as was mentioned try using 3/8" heavy duty washer welded to the bracket. 3/8" = 9,53mm -> 10mm bolt barely fits through (usually needs to be threaded through a SAE 3/8" washer).
edit: I suggest taking the trackbar bolt with you to the hardware store and check a few SAE wahsers with it. Washers usually aren't exactly to the spec., so some of them could fit over the bolt fairly well where others will definitely not.
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Unread 10-18-2013, 08:19 AM   #7
poke_53
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Will do thanks for the help.
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