Bore cylinder ...

[Van gogh]

Hi to everyone . Now I am engaged in repair of the engine , 1.9 diesel . Want to give the unit on a boring under the pistons of the increased diameter 83.5 mm , but I have a question and what should be a gap between piston and ??????????? cylinder - 0.06 ?

[Kaapelimies]

according to Haynes:
XUD9 Bore: 82,93 + - 0,009mm or 82,96 + - 0,009mm
Piston diameter: 83,000-83,018mm or 80,030-80,048mm
Piston ring end gaps:
top compression 0,2-0,4mm
second comp 0,15-0,35mm
oil scraper 0,1-0,3mm

Maybe this helps. What pistons are you going to install, and do they fit the standard connecting rod?

[Van gogh]

Thank you for participating, but I'm interested in the difference diameter of the piston and the cylinder, ie the thermal gap which is held at the bore of the cylinder block. I'm going to sharpen the cylinder block under the pistons increase in oversize, ie the standard 83.0 + 0.5 = 83.5 mm and it has oversize pistons. Somehow so ... I hope you will understand me with photos:

[mat_fenwick]

So you have purchased some larger pistons, and you now want to know how big to make the bore?

[Van gogh]

When drilling bore Turner must endure a certain size of a cylinder that would have remained gap between piston and cylinder - the so-called thermal gap which compensates for the expansion of the piston after its heating during engine operation .

I understand that none of you never repaired the engine ?


Prompt please, somewhere was a topic about repairing the hydraulic pump, the atoms can not find.

[mat_fenwick]

I know what you're saying, but I just expect the machine shop to do the work and know what size to bore! Never done anything apart from head work on an XUD engine though.

[Tinkley]

You need the Peugeot tech manual giving the clearances. I personally would be surprised if the clearance was as tight as 0.06 but it may be. It was 0.05 on my old Morini (172cc cylinder) and tapered up the bore so that data was also needed. Wear limit was also an extra 0.05 so total slop max was 0.1mm. Someone here must have that machining data. I only have it for 2 of my bikes not the car.
Some manufacturers also grade so called identical pistons with A or B or C sizes even though they are nominally the same. It is important to match the graded size with the bore size. If you want a really well balanced engine you should weigh the pistons and rods and big end and little end bearings and make up the most balanced set you can, weight wise. If you can machine stuff, usually a little under the piston skirt is acceptable to get better balance.

[Van gogh]

Classification of pistons usually refers to a motorcycle engine - the so -called size groups . And when turner chisels car engine block he must adjust each cylinder individually to a specific piston up to 0.01 . As for the balancing of the engine, and if so meticulously to this approach , the same balance and flywheel , but it is usually necessary for sporting high-speed engines . And in my case, you do not transposed the connecting rods for the factory engine is subjected to what some balancing. Personally, I have already made more than a dozen engines, but I do not have any information on XUD. This is my hobby, all my car I bought in a state of scrap metal and restores their own hands. Before, before becoming an artist I worked at the service station .

[Kaapelimies]

according to Haynes:
Piston diameter: 82,93 + - 0,009mm or 82,96 + - 0,009mm
XUD9 Bore: 83,000-83,018mm or 80,030-80,048mm

Maybe readers noticed that the piston wouldn't fit the bore, the dimensions were reversed

If I do the math: XUD9 Bore: (83,000+83,018)/2 minus Piston diameter: 82,93 we get 83,009-82,93=0,079mm that seems quite OK? If I were you I would ask a logal machining shop, it's just a normal engine and not a rocket engine. I guess you are doing the work yourself?
I have done an engine job, but all the machining was done at a shop and they had all the manuals.

[Van gogh]

Already decided everything in their forum. If someone will have to sharpen cylinders that gap - 0.05-0.07.

[Van gogh]

And to be precise here are:
??????? ??????:
??????????? ??????................................................82,930±0,009 ??
?????????? ?????? 1...............................................83,130±0,009 ??
?????????? ?????? 2...............................................83,430±0,009 ??
?????????? ?????? 3...............................................83,730±0,009 ??
??????? ????????? ? ????????:
??????????? ??????................................................. 83,00±0,018 ??
?????????? ?????? 1................................................ 83,20±0,018 ??
?????????? ?????? 2................................................ 83,50±0,018 ??
?????????? ?????? 3................................................8?,80±0,018 ??
????? ???????..............................................................0,062 — 0,078 ??
Who knows, maybe someone will have to ...

[Van gogh]

Today, Turner took the unit did not quite bad. Piston clearance made ??0.06. Here are a couple of pictures:



Please contact if anyone should .

[citsncycles]

Nice to see work like this being done on engines - most BX's here get a 2nd hand lump dropped in (if they're saved at all) when the engine lets go!

Timex's engine has been changed, but I believe my other 2 are original, so if they need work I will try to save them.

[mat_fenwick]

For me it's a question of economics - I prefer to repair than replace but swapping the engine is usually cheaper even if you do all the work (apart from machining) yourself. That said, I'm not concerned about matching numbers originality, so if the opportunity comes for improvement with a different engine then I'll take advantage.

[Van gogh]

I agree that buy an engine used cheaper , but often this purchase is " a cat in a bag " , we say so when you buy a thing and can't test it on the performance at the time of purchase . As a rule such motors are several tens of thousands of miles , and then start to take oil and this engine still have to sooner or later repaired . And when did you do your engine and know that everything is new , then you feel pain calmly and this motor will delight you with his work than a hundred thousand kilometers .