A Few Questions For Big End And Main Bearings On Xu Engines

[ifcho 0]

Hello,

 

So I have an engine block from a 1990 1.9 GTI and a 1.6 crankshaft from a 1986 1.6GTI.

 

I want to put this crank in the 1.9 block, but I do not know what bearings I should buy. The crankshaft from the 1.6 is on standard size, it has not been oversized and is nearly as new.

 

In the Hanyes I found the following information, which is very confusing for me (as I don't actually understand what the different sizes are for, but they are bothering me ):

Big-end bearing journal diameter:

XU5 series engines:

Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44.971 to 44.990 mm

Undersize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44.671 to 44.690 mm

XU9 series engines:

Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49.680 to 50.000 mm

Undersize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49.380 to 49.700 mm

 

So tomorrow, when I go to the shop, what should I tell the seller and what bearings should I get?

[brianthemagical 1]

for the big ends it will have to be the 1.6's as there not part of the block.

[uncle buck 0]

....In the Hanyes I found the following information, which is very confusing for me (as I don't actually understand what the different sizes are for, but they are bothering me ):

The sizes you have posted are the diameter of the big end pins on the crankshaft.

 

Standard will be the size of the pin if the crank has not been reground.

 

Undersize will be the size of the pin if the crank has been reground.

 

Undersize bearings are thicker to make up for the reduced diameter of the pin due to it being reground.

 

 

You should never have a crankshaft reground if it isn’t absolutely necessary.... quite often people are far to eager to have a crank ground as a matter of coarse when rebuilding an engine.

 

Regards.

Edited February 21, 2008 by uncle buck

[ifcho 0]

aha I see, so this info above is for the big ends.

 

What about the main bearings, there are five different colors?! listed for these engines, and I really have no idea which color to choose..

[uncle buck 0]

As this engine series isn't my strong point & as you are using a 1.9 block & a 1.6 crank I'll let someone with more knowledge than me answer that one.

[brianthemagical 1]

if you want to do it properly, then the best way is to get a pair or mains, fit them then plastigauge them. you can then know which bearings you need for your required clearences. the easy way, as i belive the haynes explains, is that the colours are for later barcoded engines. if is a leter one, then use them, if it's an earier engine then the normal bearings will be your answer.

[ifcho 0]

thanks, I ordered some shells.

 

Peugeot have really messed this stuff over the years

[brianthemagical 1]

What did you go for?

[ifcho 0]

I ordered the shells that are before the color type shells, 5 grooved and 5 plains.

 

It appears that before this variant came into place, peugeot were supplying 6grooved and 4 plain shells, used in different combinations.

 

I do not have the time to measure the clearences with the color type shells, but I hope that the latter ones will be just as good.

[max0 5]

I ordered the shells that are before the color type shells, 5 grooved and 5 plains.

 

It appears that before this variant came into place, peugeot were supplying 6grooved and 4 plain shells, used in different combinations.

 

I do not have the time to measure the clearences with the color type shells, but I hope that the latter ones will be just as good.

 

just wondering how much did they cost? as im thinking of rebuilding my old 1.6 engine - thanks andy

[ifcho 0]

I guess the prices will be quite different in the UK, but they were not expensive at all. around 75 euros maybe, I should check this, cause I have not paid them yet, just ordered them

 

Got some nice discount on some mahle pistons - a set of four pistons + liners + piston bolt + rings - 240 euro