Joined: May 2018 Posts: 1,918 Threads: 102
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Location: Llandrindod Wells
Car type: 29 Special, 30 RK, 28 C Cab
Hi
+1 from me.
Make sure you seal the helicoil in with Loctite as well as the sump bolt. A few of the stud holes are not blind and oil finds its way down the threads.
Cheers
Howard
Joined: Aug 2017 Posts: 607 Threads: 25
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My advice is if you have the engine out and working on the sump is if the first couple of threads are pulled,or the bolt is a bit loose in the thread when checking is just fit a thread insert. It's much easier than trying to do it in situ.
The worst situation is when someone has previously tried to drill out a broken bolt and the hole has run and or been bodged.
Joined: Mar 2015 Posts: 5,196 Threads: 223
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Location: Scotchland
I use large quantities of stepped studs and helicoils, every year.
Both work equally well, if fitted correctly, in my experience.
Joined: Aug 2017 Posts: 704 Threads: 12
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My experience of helicoils for the sump is you need to use a Helicoil plug tap to stop the inserts being threaded into a tapered thread as left by the normal taper tap. This is due to the holes in the crankcase being quite shallow.
A plug tap or bottom tap can be made by getting another tapered Helicoil tap and shortening it without overheating it.
I am sure others have views on this.
Joined: Aug 2017 Posts: 607 Threads: 25
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You can use an m8 plug tap.
Joined: Aug 2017 Posts: 1,258 Threads: 32
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Location: Cheshire
Car type: Race Ulster, 1926 Special, 1927 Chummy, 1930 Box
Ah, youth and enthusiasm, I’d have gone home.
Alan Fairless
Joined: Dec 2017 Posts: 1,132 Threads: 66
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Location: Nottinghamshire. Robin Hood County
Car type: Austin Ruby Mk1 1935
I have decided to go along the route of oversized bolts as there are only two threads too repair and I intend to do the job with the engine in the car. I will be using a silicone gasket. As to youthful enthusiasm that’s how the threads were stripped in the first place. My son is to strong for a light job.
John Mason.
Would you believe it "Her who must be obeyed" refers to my Ruby as the toy.