How not to B33!

[Dan_B33]

Thanks Neil for advise,
For sure when I have piston that will go together with barrel to the machine shop for reboring.
I will make closer picture of a head too show valve seats....I guess one bellow is not that good?
I was thinking of taking one order.....in one place there will be tones of parts i need....around 800-1000quid
Any recommendations for that? Faked?....any good?. I took sump plate ....came good price and decent quality...

[Dan_B33]

Piston crown measured in mm . I think it is Gandini...just thinking if that brand was bad or the fact that piston rings were worn out....more than 1mm slot  (clearance) when put to the barrel?
Any thoughts?

[neil1964]

The crown says 86mm so I’m guessing 40 thou over at the moment.
Funnily enough I had a Gandini nip up such that I managed to clean it up and had the bore opened up a couple of thou and had no further issues.
Ideally you need the bore measured fore and aft vs side to side.
Using an old ring does not tell you much, you can compare the gap where you are measuring in the pic and similarly at the bottom of the bore (where the rings do not run).
Is there much of a wear ridge on the top of the bore once you have cleaned the carbon ridge off?
10 thou is correct gap for top ring
I tend to try to get as much stuff NOS BSA if I can, which means scouting around a bit.  Places like Autocycle and Vale-Onslow have mainly NOS where as Classicbike/Feked and, more frequently now, Draganfly have pattern stuff of variable quality. Some UK made but more from Taiwan and India which can be well made but frequently from inferior spec materials. Definitely Caveat emptor.

[Dan_B33]

Hi Neil,
Thanks for advise about the shops.
I can see hardly any ridge there.
Pictures bellow. Stilk I need to measure whole barrel as you advised and judge....Looks like I need to hunt for decent Hepolite +0.060" to rebore....Dou you think there is still hope for +.040 and hone plus new piston set?

[neil1964]

If no wear ridge you might get away with 040 piston/rings and hone
I'd always try to preserve any bore thickness if you can but piston availability and what your engineer with correct metrics tells you

[Dan_B33]

Thanks for the tip!
I have seen some +0.040 pistons on eBay ...old stock.
I need to measure barrel from top to the bottom and get the judgement from machine shop guys...
Now I'm taking engine out to see what is with that big end?
The dent looks old on teh fly wheel....more like old workshop damage than something from the run. Anyway whole crankshaft will go to one specialist here in Poland ...
Good news not much of a metal pieces on magnetic sump plug.
I have fitted sump plate with that magnetic plug when BSA was still running....I think it had in total 1hour idling on tghat

[Dan_B33]

Some news!
Oil pump can be expensive? Make refurbishment with soft metal....comes cheap . I guess that is far from seeing original?

[Dan_B33]

Remember MagDyno surprise?
There is more in that area....missing seals....some home made bolts and .....more

[Dan_B33]

See that!
...thank God it's offline Sunday....work on BSA forbidden....otherwise I would send her a bullet...
Stay calm ....have good one

[Dan_B33]

....last one with question.
This marks on timing pinions are there for reason, right?
So the timing was a bit off? Or the set is not from this engine? What in..hell?
How to check if right timing set was installed?

[neil1964]

First you need to determine what cams you have.
Remove the cam and you should see a stamped number on the back.
Same for oil pump. Common fault is overtightened screws (distort body or strip out)
Keep going (and no ammunition left lying around!)

[Dan_B33]

Here there are cams . One is stamped but the exhaust one has no marks ...

[Dan_B33]

What I have noticed that pushrods are not even length.
Looks like one have been "fixed"!

[Dan_B33]

From good news engine case numbers are matching....what a suprise!

[Dan_B33]

Oil pump spindle...is in a bad shape. However oil pump is making nice job itself....