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Homegrown Garage Green One

Homegrown

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43
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Sweden
I have some Renaults i will try to make a tread on each. I made tiny presentation on my cars earlier.
Green One is supposed to be a daily driver. I used it a lot until engine gave up due to faulty cylinder gaskets with the result of major overheating and sized engine.
I from 1975 845cc 800-05 engine, four speed square box, drums all round has tow-bar and very versatile.
I already dismantled the engine and it’s a lot of scoring in bearings crank pistons and cylinders. So I dismantled another similar engine from 1972 that has been standing decades due to worn out camdrive. Look much better inside but two pistons was siced in then cylinders due to stuck piston rings. First I could get out with diesel soaked and heating the sleeves with heat gun and cooling with snow inside piston. The other still stuck.
I put it in my ultrasound bath and hoping to be able to get growes cleaned so rings get space in the pistons

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Homegrown

Enthusiast
Messages
43
Location
Sweden
Goal is to make one good engine out of two.
Probably use bottom end from1972 engine will reuse bearings cos they look nice. Needs new rings and cam drive (seems to be hard to find)
Anlot of sludge both in water jacket and in oil pan
Try to cook out rust from ring land area

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Homegrown

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43
Location
Sweden
Made some special tools during the process.
On the Billancourt engine it’s very tight to loosen the head bolt.
So I made some special 14mm sockets.
First on is made from 3/8 14mm socket that i have shortened just enough to cover the complete hex on bolt.
The second is made from 1/4 14mm socket. This one don’t need to be strong though there is no big force needed. Just for undo the already loose bolts. So I lathered them thin enough to take out bolts. Welded a long M6 insex bolt as shaft for cordless screwdriver See pictures
Also made som cylinder “holders “ from scrap U-iron

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Homegrown

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43
Location
Sweden
Have a feeling french engine’s getting more burnt oil debris and coal inside engines compared to other brands, maybe engines have had less oil service or bad oil quality or maybe engines get hotter inside. So far none of the engines have been clean inside. They all have burnt oil here and there.
Or maybe oil from earlier days didn’t have the good cleaning capacity like modern oils.
Happy I picked engine appart and cleaning it inside out.
Used ultrasound wash diesel wash and back to ultrasound and it comes out oil debris in what feels like newer ending story.

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Homegrown

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Messages
43
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Sweden
Two pistons were really stuck in the cylinder due to carbon buildup behind piston rings bonused with rust.
Heating cylinders cooling pistons combined with brute force did the work.
After cleaning in ultrasound bath and take away carbon in ring growes with an old piston ring that I brake in quarters. Surprised with rhe outcome seems like most parts can be used again.

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Homegrown

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Messages
43
Location
Sweden
Keep on dismantling the block today.
Was stuck on removing camshaft but due to the knowledge on this board I could make a tool from scrap metal.
Thanks mojobaby to led me in the right direction when I see your water tap in the bushing.
Found a double treaded pipe joint made in weldable material, a piece of pipe in right size and some solid end for my air chisel too work on.
Starting up the lathe to adjust diameters on the pipe to fit the rest. Bench grinder with wire wheel clean up before welding.
20min later i have a tool.
Screw it in the bushing, put on some ear protection. Start air chisel and bushing coming out with ease.
Tool is very effective can recommend to copy if you do this more than once.
I really love my air chisel (wonder how I managed before) use it very much.

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Homegrown

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43
Location
Sweden
When all moving parts are removed from block I start cleaning up all imperfections from the casting.
Both to make oil go quick to the sump and remove places for cracks to start. Did the same on the water jacket side.
Lots of thin cast iron debris in the mold joints that can fall fall of.
Half an hour vid rotating file and belt sander I’m happy with the transformation.

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Homegrown

Enthusiast
Messages
43
Location
Sweden
Wire brush block inside out and took away all sharp imperfections.
Diesel wash everything again then breakclean wash combined with compressed air afterwards.
Then mask everything that isn’t supposed to be black.
Will be a final layer before I call it a day.

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Homegrown

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Messages
43
Location
Sweden
The case getting ready for reassembly.
When camshaft was going in again I found another imperfection in the casting partly blocked oil return from camchaft. Gave it a good hit with a chisel and got rid of a lot.
I will reuse all bearings cos they look very good.
Crank I put in the lathe for a quick polish. Used low speed, 800-paper with WD40 not for remove just clean/polish.

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Homegrown

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Messages
43
Location
Sweden
I like that French ingenuity not one shaft seal in this engine.
Clean crank again. Will reuse timing gear from the “best” engine. Crank sprocket start show signs of wear just file some debris away and it have to do.
Easy to fit just using M12 bar big socket up in the wise and screw it together.
All bearings will be reused no signs of wear and good crunch when you set them in. Just oil everything and tighten 20,30,45 lbft (60Nm). Rotate smoothly.

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Homegrown

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Messages
43
Location
Sweden
Have to prepare camshaft for sprocket mounting. Did accordingly Renault instructions to the workshop.
Drill 8.5mm hole 20mm deep, tread it to M10. Lathe pinion hole wasn’t big enough so have to use the press drill instead. Prepare, drill, tread and camshaft is redy.

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Homegrown

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Messages
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Sweden
Couldn’t find what torque setting to use for bolts on cam transmission. Al bolts are M6-10/9 according to pic i shold use max 14Nm so I choose 12Nm on all.
Grease all paper seals gently, mount backplate check so all screws have clearance in respective holes.
Next up is timing chain and cam sprocket.
All marks correct so just use the gear I fixed for assembly sprocket to camshaft. Cam/sprocket should be flush then it’s good according to factory handbook.
Hydraulic tensioner have no function cos tine hole for oil was blocked. After cleaning prefilled the tensioner with oil.
Time for lunch.

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Homegrown

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Messages
43
Location
Sweden
Start check cylinders vs casing. Have a file that is milled and dead straight for that. Seems like the all are flush with deck maybe No1 cylinder is tiny tiny under.
Took a micrometer to check cylinder foot sealing. Two plastic bags unmarked with four in each. There was five 0.15mm and three 0.10mm hmmmmmm.
Think it’s time to order piston rings and some other stuff.
Also start thinking of oil control system in oil pan. Want oil pickup always suck oil it air.

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