Engine Seized? - Page 19 - Alfa Romeo Bulletin Board & Forums
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post #271 of 572 (permalink) Old 10-31-2017, 08:36 PM
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You measure the cam clearance with a feeler gauge. But you will find that there is a lot of "feel" to the task. To check that last 'thousandth, rather than slip in the thinnest blade of the feelers, switch to a pair of larger ones. E.G. if you have 0.014 thou gap , measure the next thicker with a .007 and a .008 blade (total 0.015) rather than using a 0.14 and an 0.001. I've bent and crumpled a lot of 0.001 blades.....

Robert

BTW - like many here, I've been doing this for several decades, and have collected a bunch of spacers. To keep them in order I made a holder as pictured below - two or three spacers in each slot. Since I am pretty much OC, I've sorted them in half-step sizes so I can adjust the gaps to 0.0005! Note the wooden plugs where the spacers currently in the engine are. There are another 70 spaces on the other side of this block, where all the exhaust spacers ended up. At current prices, there's over $1000 in spacers. Most cost me under $0.50 four decades ago.
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post #272 of 572 (permalink) Old 10-31-2017, 08:40 PM
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Quote:
Originally Posted by factotum View Post
I am going to show my ignorance here, but I love to learn new things, about anything. The Alfa manual shows a meter being used, which reminds me of my old vacuum meter that I used to set the air flows on SU carbs. Is the AFI meter a more accurate vacuum meter? Second, 1 1/2 percent of what, idle compared to max air flow? What is the stock factory percent?

Factotum
What your looking at is how to set the throttle valve to its correct setting. This is set at the factory and should never be messed with.

Attached are the pages for the factory shop manual on adjust the CO. The AFI meter takes the place of the old CO emissions testing machines we used to use. You will need to print a conversion chart off the internet converting the AFI number to the CO number.

Once you set the CO. I recommend around 1.5 percent. When you plug theO2 sensor back up the percentage should drop. If it doesn't the O2 sensor is not working.
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1969 1750 Spider Veloce w/dual webers, 1969 1750 Berlina, 1971 1750 Spider Veloce w/ dual webers, 1985 Spider Veloce 23,000 orig. miles, {Two} 1986 Spider Veloces, 1987 Spider Veloce bought new, 1988 Quadrifoglio, 1991 164S, Plus several more. I think they are breeding.
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post #273 of 572 (permalink) Old 11-01-2017, 06:28 AM
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Always put a towel under the chain when taking the master link out. I realize you probably already know that but just in case
I use a small stub flat head screwdriver to take the masterlink apart. From the intake side of the car put your left hand under the chain and with the right hand put the flat head on the open end of the master link and pull it towards you. The open end always goes towards the exhaust side. The bolt on the front of the head that locks the tensioner in doesn't have to be gorilla tight, just tight. There are a lot of these little things that will help you enjoy the process and have a motor you can be proud of.

The passenger seat is 15 miles an hour faster than the drivers seat.

currently
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale
1972 GTV
1974 GTV
1974 GTV
1977 Spider
1974 Spider
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post #274 of 572 (permalink) Old 11-01-2017, 09:50 AM
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Quote:
Originally Posted by gigem75 View Post
Always put a towel under the chain when taking the master link out. I realize you probably already know that but just in case
I use a small stub flat head screwdriver to take the masterlink apart. From the intake side of the car put your left hand under the chain and with the right hand put the flat head on the open end of the master link and pull it towards you. The open end always goes towards the exhaust side. The bolt on the front of the head that locks the tensioner in doesn't have to be gorilla tight, just tight. There are a lot of these little things that will help you enjoy the process and have a motor you can be proud of.
Uhhh. The chain accelerates toward the exhaust side when the throttle is pushed. Therefore the open end of the link should go to the INTAKE side.

One of us is wrong. If it's me, it won't be the first mistake today, but I think I'm right. IF not, why?

Robert

BTW - I always put a wire thru each side of the chain before removing the link - it only took dropping the chain into the engine once to understand why. Towel - yes, me too. And I stick a big magnet on the chain too, so no loose part goes anywhere. I learned this according to Rule One.

[Rule One - we never learn from success!]
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post #275 of 572 (permalink) Old 11-01-2017, 10:27 AM
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Quote:
Uhhh. The chain accelerates toward the exhaust side when the throttle is pushed. Therefore the open end of the link should go to the INTAKE side.
Agree.
I have always tied the ends of the chain in order to retrieve them but I helped Rob Mocas replace a head gasket on his race car at Watkins glen in September and he just let the ends drop. He retrieved them with a magnet and that is how I plan to do it next time.

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #276 of 572 (permalink) Old 11-01-2017, 02:07 PM Thread Starter
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I initially tied a strand of parachute cord to each end of the chain for easy retrieval. Obviously, once I completely disassembled the engine, it was a moot point.

-Kevin
1988 Spider Veloce (with lots of 3D printed parts)
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post #277 of 572 (permalink) Old 11-01-2017, 02:11 PM
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You'll be back at this as you reassemble everything.

Robert
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post #278 of 572 (permalink) Old 11-01-2017, 03:47 PM
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yeah, I put safety wire on the ends but the magnet works ok too. Only thing about the chains being down is if for some reason the motor needs to be rotated which I will some times do to have all four pistons half way up, or down. The reason being is I can turn the cams to adjust the valves although I have to remember which way I turned it so I can come back to where I left. My thinking on the split link is that the motor rotates clockwise looking at the front so the open end is leading and the closed end will keep it on when I hit the gas. The first law. Now if the motor seized it could fling itself off (the third law). I figure if that happens I have bigger problems than the split link staying in motion.

The passenger seat is 15 miles an hour faster than the drivers seat.

currently
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale
1972 GTV
1974 GTV
1974 GTV
1977 Spider
1974 Spider
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post #279 of 572 (permalink) Old 11-01-2017, 07:25 PM
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Most of my chain experience is with motorcycles and everyone I know or have known has fitted the clip with the closed end pointing in the direction of motion.
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Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #280 of 572 (permalink) Old 11-01-2017, 07:54 PM
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The fish always swims upstream !

'64 Guilia Spider
'67 GTV
'68 Giulia Super

Conservatives-we work hard, so you don't have to !
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post #281 of 572 (permalink) Old 11-02-2017, 06:21 AM
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Going back through some of the threads it appears the conventional wisdom is to have the open end towards the intake side. To be honest I never gave it much thought until I saw several years ago another thread saying to install it towards the exhaust side so I started doing it that way. I've not had any problems in that department. The factory shop manual says to replace the masterlink each time which makes sense if it's the original one. The one failure documented was not due to the direction but rather the circlip being loose and going on to easily. He learned the hardway to replace it. So no matter what you do I would highly recommend you spend the extra $5.99 and get a new one.

The passenger seat is 15 miles an hour faster than the drivers seat.

currently
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale
1972 GTV
1974 GTV
1974 GTV
1977 Spider
1974 Spider
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post #282 of 572 (permalink) Old 11-02-2017, 07:58 PM Thread Starter
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The engine overhaul manual does not illustrate nor mention a preference for the direction of the master link.

-Kevin
1988 Spider Veloce (with lots of 3D printed parts)
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post #283 of 572 (permalink) Old 11-02-2017, 08:02 PM
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But it also does not point out the direction to tighten a 12 mm nut. Knowledge of some things is always assumed.

R
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post #284 of 572 (permalink) Old 11-02-2017, 08:40 PM
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I've taken enough heads off of these engines back in the day when they were just cars that the buyers drove for daily transpiration. A lot of them were under warranty before anyone else had worked on them since leaving the factory. The open end goes toward the exhaust cam.

Or as they told us in Alfa training class. The fish swims upstream.
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1969 1750 Spider Veloce w/dual webers, 1969 1750 Berlina, 1971 1750 Spider Veloce w/ dual webers, 1985 Spider Veloce 23,000 orig. miles, {Two} 1986 Spider Veloces, 1987 Spider Veloce bought new, 1988 Quadrifoglio, 1991 164S, Plus several more. I think they are breeding.
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I just got 2 more. Now I have a Matta. I must be crazy.
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post #285 of 572 (permalink) Old 11-03-2017, 07:12 AM
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"Or as they told us in Alfa training class. The fish swims upstream."

Must have been in my class !

'64 Guilia Spider
'67 GTV
'68 Giulia Super

Conservatives-we work hard, so you don't have to !
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