Technical 176B9000 technical information

[st1242]

As i am looking forward to begin a rebuild at a second B9000(mk1 1242 16v) engine that i got as spare,i am looking for some special technical info such as cylinder head height,cylinder pressure of a healthy engine and such stuff that unfortunately i cannot find any info.

Also,if someone has used aftermarket pistons of OEM design and of which brand as most of what i find in the web ia out of stock(i'd prefer Mahle but...).

If somebody has any info,i would be grateful.

 

[st1242]

I suppose that after all these years,information about this engine is rather rare so,if anyone might be interested,i found that this engines BMEP is somewhere around 165 psi...

Also luckily i managed to find oversized Mahle pistons at a reasonable cost.

 

[GrandePunto PL]

Try here, Punto and other models from the era. Maybe there will be some info you're looking for...
http://download.fiatforum.bg/Books/
You can also take an educated guess and take data from older and/or newer units (same type/displacement), compare all "1,2 16Vs" out there.

Rumors are that height is about "77 mm" with small tolerance. You can gently skim it (as little as possible - just don't mess up the combustion chambers).
Compression is a range "10-14 bar" (probably 14 is good, 10 is a bare minimum).

 

[the green vanper]

I've just uploaded x176 eLearn docs on the forum here, should be available shortly in the downloads section of the forum.

https://www.fiatforum.com/downloads/x176-punto-elearn.577/

 

[GrandePunto PL]

______________________________ It doesn't work._________________________________________
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[the green vanper]

Yes, the files were messed up, I haven't realised that there's a limitation to 20 files only, so had to delete it and upload once again in parts. It's avaiting validation.

 

[GrandePunto PL]

Some sources say that engine head height is 77 ± 0,05 mm, so pretty tight tolerance.
Others are more forgiving: 77 ± 0,2 mm. Same for 1,2 and 1,4 16V.
Example (exhibit), eLearn for Punto2: https://aftersales.fiat.com/elearnsections/main.aspx?nodeID=3119205&languageID=2&markID=1&modelID=2000003&valID=2000307&prodID=2003009&modelName=Fiat - 188 - Punto Classic&langDesc=English&sectionName=Dati Tecnici&validityName=1.2 16v&isExaminer=
So in general, Yes, you can take data from other models/generations. Roughly they are all the same (most numbers).

 

[the green vanper]

That's in on of the uploaded documents (x176 Punto eLearn - 00 INTRODUCTION AND TECHNICAL DATA - '97 RANGE - 1108 SPI - 1242 SPI - 1242 MPI - 1242 16v - 1372 T - 1698 TD60 - 1698 TD70.pdf, starting on page 12 of the PDF file).

 

[st1242]

Sorry for the delayed answer,i just managed to get an update of the situation...

First of all thank you all for your help and interest with manuals and so,it has been a great help for info i'd never thought i get so easily.

I made a compression check and there is an odd situation with the two cylinders,at first sight i would thought of a head gasket loosing compression but nearby cylinders don't match compression numbers...
So i suppose that the issue is from excessive wear probably from the piston rings.

 

[st1242]

From what i suspect,the proper compression of this engine is nowhere around 165-170 psi as i read somewhere but it is probably around 13/14 bar(200+ psi) as you mentioned before.
Of course the engine has never been rebuilted,it has almost 400.000 klm on the dials and the only service that was made was a head gasket replacement along with valve seals,ets aprox 100.000 klm ago...

The oil consumption is rather high with almost 1,5 liter per 5000klm with daily normal use.
So probably i will start rebuilding a second engine block that i got...

 

[st1242]

I also measured and two cylinder heads that i got,the one is 77,04mm and the other one is 77,45mm and i also noticed that there is quite a lot improvement to be made,not by port shaping but generally by port matching as the three items of the induction system have slight differences between them.
I had similar experiences with other brands(Peugeot,Renault) and the difference is quite noticeable from blueprinting these items which really has no cost to fix/match.

 

[the green vanper]

I also measured and two cylinder heads that i got,the one is 77,04mm and the other one is 77,45mm and i also noticed that there is quite a lot improvement to be made,not by port shaping but generally by port matching as the three items of the induction system have slight differences between them.
I had similar experiences with other brands(Peugeot,Renault) and the difference is quite noticeable from blueprinting these items which really has no cost to fix/match.

Effects of mass production I'd say.

If you plan to keep the car, go for the rebuild. 400 tkm is a lot.

 

[GrandePunto PL]

Very first thing you do in any Fire family engine is "piston soak" (kerosene/"lamp oil"), to free the rings (they tend to clog with sludge, burnt oil residue).
Numbers are acceptable (both 12 and 14 bar)...if they were equal (so try to make them closer).

 

[st1242]

Effects of mass production I'd say.

If you plan to keep the car, go for the rebuild. 400 tkm is a lot.

Basically it was bought as a daily ride but i also have another one for spare parts so it is something that is going to stay,hopefully for a long time or until i run out of spare parts...

As i said,i found new pistons to prepare the other engine block but i also have to keep up with family daily expenses so it will need some time to get it done.

 

[st1242]

Very first thing you do in any Fire family engine is "piston soak" (kerosene/"lamp oil"), to free the rings (they tend to clog with sludge, burnt oil residue).
Numbers are acceptable (both 12 and 14 bar)...if they were equal (so try to make them closer).

Thats exactly what my mate(mechanic) said,that oil consumption might be from stuck oil rings but if it was from such a thing,would this effect the compression test?

In any case i change oil/filter every 5000km and i was thinking about engine flush which i tried in other engines and it seemed to work regarding deposits.
But i have never tried with kerosene or lamp oil,i simply knew that it was a very good solution to keep transmission chain clean in motorbikes.