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I've tried to fire up my freshly rebuilt B-20 but so far not so good. I have spark at least sufficient to fire a timing light. Also visual check. There is gas at least to the carb jets. [SU-H6] I just visually set the timing to about 0 deg and tried to start er up. I got absolutely nothing even with some starter fluid until I radically advanced the timing and then just got a couple of good bangs [no exhaust system yet]. I'm pretty sure that the cam is indexed right and I'm also pretty sure that my timing isn't 180 deg off but anything's possible. Can anyone give me a little advice on getting this thing to run? By the way, the cloth covered tubes fron the float bowls to the jets seem to be leaking. Are they normally clamped? I don't recall that the originals were.
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Thanks everyone. When I finally started looking at the basics, sure enough the timing was 180 deg off. Switched around the plug wires and it fires right off. Now I guess I have some work to do on the carbs so it'll stay running without playing with the choke and gas. I also would like to get things turned around so that #1 on the distributor is at the front. I suppose that means driving the pin out of the dist gear and reversing it, right? Well anyway I feel good that I seem to be making some progress.
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Buz,
Don't feel bad. From the number of times this issue has come up here, I would guess that it happens to five out of ten tyro Volvo engine builders; including this guy. (I figured it out before I appealed for help on the BB, but it took me quite a while before I did.) The instructions in the manual are not the clearest on this matter.
Bob S.
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We don't stop playing because we grow old, we grow old because we stop playing.
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Yeah, I've heard that when the drive gear is correctly positioned in the manner shown in the manuals, it is actually TDC, ready to fire on #4, not #1.
I'd just take the drive gear out, rotate it 180 degrees, and reinsert. Instead of making a 'backwards' distributor. Although I guess it really doesn't matter, what are the odds that you'll be swapping distributors in the future and not remember this?
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I'm JohnMc, and I approved this message.
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Buz;
I expect, you don't have one of the critical components required for an Otto engine:
Mixture, compression, spark (...and at the right time would be nice!)...
Good Hunting!
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And if spraying starter fluid in doesn't help, you know it is either compression or spark.
About 6 months ago after replacing the head gasket on my Jetta's VR6, I couldn't get it to start for about a week. I tried *all sorts* of fuel and ignition diagnostics, it all looked fine. In the end it was 'compression' missing, I had used an inspection hole in the bellhousing to align a pointer on the pressure plate to indicate TDC, and lo and behold there were several look-0alike pointers, as I discovered a week later when I pulled the shrouding off the front pulley and saw timing marks there too. The cams were times about 20 degrees off, and it simply wasn't pumping enough air to run.
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I'm JohnMc, and I approved this message.
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posted by
someone claiming to be belinda
on
Fri Mar 10 16:25 CST 2006 [ RELATED]
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"I got absolutely nothing even with some starter fluid"
you mean you took the air filters off and quirted some starter fluid in each carb? By starter fluid, do you mean gasoline? My car had been sitting almost a year until a couple days ago, and we had to do this (used a big plastic syringe with about 50 mL of gas in it, and squirted that into both carbs a few times while turning the starter) a couple times to get the car to start.
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posted by
someone claiming to be Barongrey
on
Fri Mar 10 04:37 CST 2006 [ RELATED]
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Get it going yet?
If you've tried everything, here are a few more things to consider:
The timing gears may be installed wrong. Did you get that far in your rebuild? It's not as simple as it seems to get those gears just right. You can check the position of the #1 cylinder by setting the timing mark on 0 and pulling the #1 plug. Look through the plug hole to observe the position of the piston. You may be able to slide a thin wood or metal rod through the plug hole to rest on top of the piston. Then slowly turn the engine a little by hand and watch or feel the rod to figure out if the piston tops out just as the engine passes the TDC mark.
Also, you may have a weak spark. Check your plug gaps and wait until after dark to spin the engine with the threads of the plug grounded against the block. Your spark should be a hot blue-white.
If you have a weak spark check out the engine grounding strap. A weak or absent ground can prevent your engine from starting.
Gotta stop here - out of space.
Good luck, Steve
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I think I read a few days back that you had some question about adjusting the valves, so here is the way I did mine.
remove the spark plugs and line the timing mark on on TDC. Be sure #1 cyl is on compression stroke and adjust rockers #1,#2,#3, and #5.
Put #4 cyl on TDC and adjust #4,#6,#7,and #8.
They can be adjusted hot or cold, but a little better if the engine is warm.
I could send you the instructions out of the book if you like.
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The pops make it sound as if the ignition isn't right.
Turn the motor around until the timing light shows #1 firing. Might be easier to just take the cap off and slowly rotate to motor around until the rotor is pointing at where the #1 spark plug wire would be, and the points open. Verify with the timing marks on the pulley that you are in the general vicinity of TDC. Then look in the valve cover (might have to remove it unless you have one of the later 'front' filler caps) and make sure that both #1 valves are closed. I'd suspect you are 180 degrees off.
There is probably some sort of exact science floating around regarding how to position the distributor drive gear, but I always seem to get it off, and just have to tinker around with it for a while to get it going. There's that picture floating around shoing the slots on the drive gear, supposedly with the engine at TDC, they are at a 45 degree-ish angle. I always strive for that and it rarely seems to work for some reason. In any case it is very hard to position that timing gear where you want it because of the way it rotates as it goes down, compounded by the way you will rarely get it to go all the way down and seat into the oil pump drive at the same time.
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I'm JohnMc, and I approved this message.
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Wires going to the right plugs? 1-3-4-2 in counterclockwise order. Timing marks lined up properly?
Rob
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Timing will be 20 degrees BTDC. If you have fuel and spark, and you're sure the distributor is in the right way around, it will run. Check your firing order, then if it still doesn't fire, swap the plug wires 180 degrees instead of trying to stab the distributor again.
Pull the plugs and check for mashed electrodes (too long of plugs will hit the top of the piston) and fouling. Clean and gap as needed.
If it still doesn't work get out your biggest hammer and threaten it.
It sounds like you're doing everything right, just need to finess it a little!
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