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Engine rebuild observation.
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Ray White



Joined: 02 Dec 2014
Posts: 7077
Location: Derby
PostPosted: Sat Aug 17, 2024 9:04 am    Post subject: Engine rebuild observation. Reply with quote
I was watching a repeat of a CAR SOS programme where they restored a Riley RMF.
When Fuzz removed the head he found many regularly spaced rust marks down the bores. He surmised that these had been caused by the owner who over the years had been regularly turning the engine over on the handle to keep it free. In between each freeing off, the piston rings had rusted to the bores again; each time, leaving witness marks.

I had never seen this before.
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Bitumen Boy



Joined: 26 Jan 2012
Posts: 1763
Location: Above the snow line in old Monmouthshire
PostPosted: Sat Aug 17, 2024 5:03 pm    Post subject: Re: Engine rebuild observation. Reply with quote
Ray White wrote:
I was watching a repeat of a CAR SOS programme where they restored a Riley RMF.
When Fuzz removed the head he found many regularly spaced rust marks down the bores. He surmised that these had been caused by the owner who over the years had been regularly turning the engine over on the handle to keep it free. In between each freeing off, the piston rings had rusted to the bores again; each time, leaving witness marks.

I had never seen this before.


I would sort of expect that someone careful enough to keep on turning the engine by hand would also have been careful enough to put a little oil down the bores.
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Ray White



Joined: 02 Dec 2014
Posts: 7077
Location: Derby
PostPosted: Sat Aug 17, 2024 5:27 pm    Post subject: Re: Engine rebuild observation. Reply with quote
Bitumen Boy wrote:
Ray White wrote:
I was watching a repeat of a CAR SOS programme where they restored a Riley RMF.
When Fuzz removed the head he found many regularly spaced rust marks down the bores. He surmised that these had been caused by the owner who over the years had been regularly turning the engine over on the handle to keep it free. In between each freeing off, the piston rings had rusted to the bores again; each time, leaving witness marks.

I had never seen this before.


I would sort of expect that someone careful enough to keep on turning the engine by hand would also have been careful enough to put a little oil down the bores.


Me too. Perhaps they just didn't think it necessary. I suppose if the corrosion is not serious the bores could be honed.

DIY hone drill attachments...are they any good?
.
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Vintage Fly Guy



Joined: 27 Jun 2024
Posts: 170
PostPosted: Sat Aug 17, 2024 11:21 pm    Post subject: Re: Engine rebuild observation. Reply with quote
Ray White wrote:


DIY hone drill attachments...are they any good?
.


I used one to good effect on a 1939 Lister A stationary engine, and ended up with excellent compression and a very sweet running engine. However, I don't think I'd risk using one on an engine rebuild on a valuable classic car: Each of the long stones pivots on the mounting point in the middle like a windscreen wiper, so any deflection at either end will be replicated in reverse at the other.
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ukdave2002



Joined: 23 Nov 2007
Posts: 4231
Location: South Cheshire
PostPosted: Sun Aug 18, 2024 7:17 am    Post subject: Reply with quote
I have used them, more frequently the smaller version for wheel cylinders. They don?t put much pressure on the cylinder walls, so would be difficult to do any damage, they have always worked well for me.

I suspect a professional engine shop will tell you that they can?t match the honing tools they use, and they are probably right, but as with many things in life it all relative.
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