Silverline Concrete Rubbing Brick 24 Grit (918552)

Product Information

Personally I think it's a none starter, it may well resist the heat, it'll be protected by the plug after all, think the trouble you'll have is trying to cut a new thread, there simply won't be enough surface area for it to bond too and resist the cutting action of the tap. The joints are then brush cleaned to remove excess dust and depending on conditions careful washing out with a hose may be appropriate; however, this would preferably be done at least the day before the application of mortar.

The mortar should be made using sand appropriate to the masonry being worked on. A 50/50 sand such as CLS30 (50/50 coarse and fine sand – supplied by Cornish Lime) is the most popular for this type of work; while CLS35 (a fine clean washed plastering sand) has been used to good effect on numerous projects, where a coarse sand wasn’t appropriate to the masonry. View our range of coarse and fine sands. Aftermarket heads are allegedly 100US. Normally this would be unbelievable, but there was a Charade clone big in China, so maybe just possible. Unfortunately the engine number is on the head, probably precluding a swap in Taiwan. I used ring-pull tabs from Budweiser beer cans (“the King of Beers” yeh, right) as standard test pieces, which seemed somehow appropriate for testing For this series I also measured the temperature of the exposed part of the iron, which reached a maximum of around 150 to 170C.

Specifications

Before getting started, remember that the appropriate PPE measures should always be used when working with lime. While the joints to the masonry need to be appropriately prepared it doesn’t necessarily demand the same thoroughness as that for pointing. Nonetheless the works should be conducted in a diligent manner with the joints cleaned out to a depth not less than 10 mm but ideally 10-15mm for improved key.

If tapping doesn't work, casting threads around a suitable greased bolt (if I can get one) might be an option, though might end up plugging the hole permanently. It wasnt using a lot of oil or noticably down on compression before this unfortunate series of events, so unless the damage is very recent, which I have no particular reason to believe, it wasnt apparently having much functional impact. Can't believe there isn't a local machine shop that couldn't fit a helicoil for you, it really is the proper way to do it tbh....... There will be heritage building professionals carrying out this work but numbers and levels of skills are unclear.

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Re it being "the prop[er way to do it", aside from, tbh, not giving a tinkers damn about the "proper" way to do anything, I'd say it was analagous to doing a dental implant without trying a filling first. Would seem rather improper behaviour in a dentist.

After placing, lime mortars need to be properly cared for; during the winter, they need to be protected from too much rain, especially during any spells of frost which can damage the mortar or cause it to fail completely. At all other times mortars should be prevented from rapid drying, either by wind or sun as this will desiccate (dry out) the mortar and prevent proper hydration or carbonation of the lime binder used, often resulting in a failure whereby the mortar becomes very weak and friable. Therefore, appropriate protection is a must. In all instances it may be beneficial to protect the hessian with polythene; during the winter to keep it dry so improving its thermal protection, and during the summer it will help to keep it damp for longer, increasing humidity where it’s needed. Finishing

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Legislative issues: Health and Safety is an unavoidable but significant cost. Conservation work generally falls within the construction industry and therefore carries responsibilities under current health and safety legislation; these are outlined principally under the CDM (Construction Design Management) Regulations. You haven't yet told us what you intend to do about the scored cylinder liner yet, think that could be a bigger problem to solve, have you found oversize pistons and rings and a full gasket set?