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7A rebuild: projectcar nameless 1

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 Post subject: 7A rebuild: projectcar nameless 1
PostPosted: Sun May 07, 2017 7:52 pm 
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I'm rebuilding and replacing the 7A in my early 1990 90 Quattro.

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I broke it. It was kaput for a long time, almost four years.

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Most recently, in her new home:

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Going to pick this beauty up this weekend :drool:

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It shouldn't be too hard to assemble the engine, but for torque specs and special instructions I have a Special Edition Chilton Import Repair manual that covers Audi from late eighties to mid-nineties, including the 7A years; 1989-1991.

Anyone know where I can source a print, or electric copy of the Bently manual?

Cheers


Last edited by solidengineering on Tue May 09, 2017 10:33 am, edited 2 times in total.

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 Post subject: Re: 7A rebuild: project becauseracecar
PostPosted: Mon May 08, 2017 4:44 am 
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Posts: 134
Cam sprocket 59 ft. lbs (80 Nm)
Crank pulley 256 ft. lbs
Idler pulley 7 ft lbs
H2O pump 15 ft lbs (20 Nm)
valve cover 7ft Lbs

_________________
-2012 Audi S5
-90 CQ (07K HX35 01E in progress)
-91 CQ WinterSoldier (Being Restored to Glory)
South Bend IN


Last edited by CoupeMaster on Mon May 08, 2017 5:57 am, edited 1 time in total.

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 Post subject: Re: 7A rebuild: project becauseracecar
PostPosted: Mon May 08, 2017 4:46 am 
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the above i found it here: viewtopic.php?f=10&t=38050
I am also looking for the torque specs. head bolts, oil pan bolts and we should be good

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-2012 Audi S5
-90 CQ (07K HX35 01E in progress)
-91 CQ WinterSoldier (Being Restored to Glory)
South Bend IN


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 Post subject: Re: 7A rebuild: project becauseracecar
PostPosted: Mon May 08, 2017 2:26 pm 
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So here's what I have for head bolt specs,

Image

going to look for the oil pan


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 Post subject: Re: 7A rebuild: projectcar nameless 1
PostPosted: Mon May 15, 2017 1:33 pm 
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Okay, got my replacement 7A block, and now the waiting... going to clean the cylinder head, buy a bottom end gasket kit, HG, upper gaskets, belts. I'm dropping the A/C compressor, it never worked anyways.

I'm apprehensive about the oil pump, I've heard getting the front seals right is a bitch.

I'm trying to not buy a picker, but I'm guessing it would be a stretch to assume I can remove and install the shortblock with a few jacks wheeling it into place.

cheers


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 Post subject: Re: 7A rebuild: projectcar nameless 1
PostPosted: Tue May 16, 2017 5:06 am 
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solidengineering wrote:
Okay, got my replacement 7A block, and now the waiting... going to clean the cylinder head, buy a bottom end gasket kit, HG, upper gaskets, belts. I'm dropping the A/C compressor, it never worked anyways.

I'm apprehensive about the oil pump, I've heard getting the front seals right is a bitch.
cheers


front seal wasnt too bad especially after removing the oil pump
I got Victor Reinz short block gasket kit from ebay for like 55 bucks

solidengineering wrote:

I'm trying to not buy a picker, but I'm guessing it would be a stretch to assume I can remove and install the shortblock with a few jacks wheeling it into place.

cheers
.
it is doable but it is gonna be a bitch i guess 2x4 might help with the jack

_________________
-2012 Audi S5
-90 CQ (07K HX35 01E in progress)
-91 CQ WinterSoldier (Being Restored to Glory)
South Bend IN


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 Post subject: Re: 7A rebuild: projectcar nameless 1
PostPosted: Tue May 16, 2017 5:47 am 
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btw did you rename your thread?

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-2012 Audi S5
-90 CQ (07K HX35 01E in progress)
-91 CQ WinterSoldier (Being Restored to Glory)
South Bend IN


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 Post subject: Re: 7A rebuild: projectcar nameless 1
PostPosted: Tue May 16, 2017 11:19 am 
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the other name was trademarked, apparently.

So I have two 7As; one has a broken rod and spun bearing, assumed and at least. I would not be surprised if the crankshaft was warped as well, because I drove it some 20 miles home that night, it almost made it. Despite the bottom end 'clank' when turning it, the cylinder walls in this 7A have no perceivable wear, and are very smooth up to the top.

Second 7A is stripped to the short-block, cleaned and refreshed, from a running car of unknown miles. I am suspicious this is a 'late' motor, unfortunately, but it will still work for me. Though it is in good working order, a noticeable lip has formed about 3/8" below the top of the cylinder right where the rings should be; this makes me wonder if this block had a grip of miles, or maybe it was beat on heavily. With almost 1/32" wear on both sides of the cylinder, none fore and aft, I have to assume this will result in less compression, and less reliability.

Ultimately I want to build one of these 7A into a turbo, but also I would like to part one out to pay for gaskets, belts, head studs...etc. A turbo 7A doesn't sound any more feasible than sourcing an AAN or 3B, so maybe forcing induction in this platform is a big waste of time. Dunno. Wondering if I should just slap a running motor together with the worn block, while rebuilding the less worn block for turbo spec, from the bottom out, OR, rob the best parts of each block to form a Franken-NA-7A, part out the other one.

Maybe I'll just sell the damn thing. This is frustrating.


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