Sump bolt crossthreaded

Post Thu Jun 30, 2016 9:41 pm

Hello everybody.. been a while since I posted on here.. here goes

I just fitted a replacement sump and went to put the new sump bolt in and the thread is so bad that at one point the bolt can be seen to have a slight wobble.

I've been advised that I use a taper and make the whole slightly bigger but then where would i get the new correct size bolt from?

I am in a dillema as I have only just finished fitting it tonight (keeping in mind I have been doing it bit by bit after work). And want to hopefully sort it out without having to remove the sump again.

Any advice would be appreciated!! Thanks in advance people..

Post Thu Jun 30, 2016 10:22 pm

Does the bolt tighten up? As in flush to the sump.

Post Thu Jun 30, 2016 10:28 pm

I would start with the correct size tap and try retapping it, if that doesn't work find someone with a time sert kit and use a threaded insert.
http://www.threadrepairkits.co.uk/timesert%20kits.htm

Post Thu Jun 30, 2016 10:43 pm

maxfield wrote:Does the bolt tighten up? As in flush to the sump.

It does tighten up but not as tight as I would like. I have used ptfe tape to make it tighter but it hasn't helped much.

Post Thu Jun 30, 2016 10:43 pm

maxfield wrote:Does the bolt tighten up? As in flush to the sump.

It does tighten up but not as tight as I would like. I have used ptfe tape to make it tighter but it hasn't helped much.

Post Thu Jun 30, 2016 10:45 pm

fixedwheelnut wrote:I would start with the correct size tap and try retapping it, if that doesn't work find someone with a time sert kit and use a threaded insert.
http://www.threadrepairkits.co.uk/timesert%20kits.htm

I have retapped it with m12 which I believe is right. Still not as tight as I would like, even with the ptfe tape.
Next step is m14 and a bolt from a Mercedes or Honda I think.

Post Thu Jun 30, 2016 11:05 pm

i dont think there standard m12 there metric fine probably so the hole is screwed no pun intended lol your going to have to heli coil it

Post Thu Jun 30, 2016 11:47 pm

Fiting a helicoil isnt as dawnting as it sounds ,i did it on my broken exhast stud,great first time results

but if its a sump bolt im not envionus,but doable

Post Fri Jul 01, 2016 12:09 am

I've been looking into the helicoil. Sounds very easy to fit. Need to see if i can get hold of one tomorrow.

Anyone know where I can get one from?

Post Fri Jul 01, 2016 12:29 am

yeti wrote:i dont think there standard m12 there metric fine probably so the hole is screwed no pun intended lol your going to have to heli coil it

Do you know what the standard size is? I think it may be m10 in that case as the m12 tap did take off some metal.

Post Fri Jul 01, 2016 7:24 am

Looked into it, the standard bolt is m12 1.5. I'm going see if i can get hold of a helicoil!!

Unless anyone has a better suggestion?

Thanks guys for your advice, I appreciate it!

Post Fri Jul 01, 2016 5:17 pm

Sorry bud but take the sump off and do it right.
You only need a small amount of swarf to get into the oil system to create havoke .
Helicoils are superb when done correctly (done thousands in my time ) (toolmaker by trade) and don't forget that the copper washer is the important seal here.
I helicoil ally and cast iron at work and you have to be a complete fool to strip the thread afterwards.

Mart.

Post Fri Jul 01, 2016 9:56 pm

I got the helicoil kit today and fitted it after work. I ran oil through the car whilst having it tilted to clean out any possible debris, I even used a cotton bud to make sure i got it all out.

Ran the car for about 20mins after levelling out the car/oil etc and all seems good.

Thanks for the advice Mart, I actually got a new sump plug and washer as I understand its the washer that seals it up and not the thread of the bolt.

I do love the zone