clockwise/anticlockwise, very confused
Hi everyone,
I am trying to adjust the valve clearance on a 90 Accord. Hayne's manual says to turn the crankshaft pulley clockwise to get at TDC on no. 1 cylinder and adjust the valves. To adjust no.3,4 and 2 valves, turn the crankshaft pulley anticlockwise. Is it a typo error to turn the shaft clockwise ? If it is Hayne's error and I have already done that, what should I do? Will it harm the belts ? Should I readjust the belt tension first ? Very confused. Many thanks for replying Don |
Re: clockwise/anticlockwise, very confused
In article <Q8Eqc.21628$0e6.20854@clgrps13>,
"dpduff" <dpduff1@telusplanet.net> wrote: > Hi everyone, > I am trying to adjust the valve clearance on a 90 Accord. Hayne's manual > says to turn the crankshaft pulley clockwise to get at TDC on no. 1 cylinder > and adjust the valves. To adjust no.3,4 and 2 valves, turn the crankshaft > pulley anticlockwise. Is it a typo error to turn the shaft clockwise ? If it > is Hayne's error and I have already done that, what should I do? Will it > harm the belts ? Should I readjust the belt tension first ? Very confused. > Many thanks for replying > Don > > I don't know about the Accord, but I've been adjusting valves on my trusty VW for about 15 years now. Which way does the engine rotate when running. If it runs counterclockwise AND the firing order is 3-4-2-1 (AKA 1-3-4-2, AKA 2-1-3-4, you get the idea, it's start anywhere) then the manual is correct and you should find TDC on #1 (by distributor rotor position I presume), then move back (CCW) to #3. One way to find out what cylinder is at TDC is to just wiggle the rockers, if you have rockers. Could be you're dealing with an overhead cam here. In which case you can only do your investigating with a feeler gage. Anyway if you put a feeler gage in and find that both valves are REALLY tight, then you probably have the wrong cylinder. Experimenting a bit with this will quickly tell you if you're going in the right direction and have the right firing order. Be warned, however, that sometimes the piston that is 180-degrees out of phase with the TDC piston can look like it's valves are closed (nice feeler gage gaps) but one valve can feel just a tad tight. This probably isn't TDC. As a general rule if you find tight valves on an old engine (10,000 miles on it or more) then you've got the wrong cylinder. Valves will loosen with age except during the run-in period when they are seating. Hope this helps, John -- Use plasma destruct ray on address to reply via email. |
Re: clockwise/anticlockwise, very confused
Short answer: The Hayne's manual directions are fine.
"dpduff" <dpduff1@telusplanet.net> wrote > Hi everyone, > I am trying to adjust the valve clearance on a 90 Accord. Hayne's manual > says to turn the crankshaft pulley clockwise to get at TDC on no. 1 cylinder > and adjust the valves. Other manuals for circa early 1990s Hondas say just get the #1 cylinder at TDC *without* specifying which direction one should rotate the crankshaft. See for example these directions for a 1991-1993 Accord, especially step 2: http://www.honda.co.uk/owner/AccordManual/400/5-14.pdf Also, for a circa 1990 Honda Concerto: http://www.honda.co.uk/owner/Concert...sk301/5-13.pdf And for a circa 1990 Prelude: http://www.honda.co.uk/owner/Prelude...2sf100/5-8.pdf Also, the steps for removing the rocker arm on a 1990 Accord also have you rotating the crankshaft so #1 cylinder is at TDC, but again no rotational direction is specified. From the www.autozone.com site, see http://tinyurl.com/2yjta While driving, the crankshaft pulley rotates COUNTERclockwise while standing next to the front left wheel and looking across the engine to the passenger side. When one is doing this maintenance, will it hurt to rotate the engine in the clockwise direction? I can't really imagine how. The pistons move up and down regardless. I can't think of a part in the crankshaft system that would be hurt by rotating clockwise. I checked my car's valve clearances a few months ago for the first time. I think you should just rotate the crankshaft manually in the direction that requires the least amount of rotation to get #1 cylinder at TDC, per the description in the manuals above. > To adjust no.3,4 and 2 valves, turn the crankshaft > pulley anticlockwise. Correct. I think the only reason for this is simply that the correct firing order is 1,3,4,2. Thus as the crankshaft rotates COUNTERclockwise 180 degrees, the next valves that are correctly positioned for TDC are #3's. Another 180 degrees, and #2's valves are correctly positioned for checking the valve clearance. Etc. I trust you are aware that your car has a 4-stroke engine, so two revolutions of the crankshaft occur to complete one cycle. During these two revolutions, each cylinder fires exactly once. > Is it a typo error to turn the shaft clockwise ? Good question. Maybe there's some minor advantage to rotating first clockwise and then counter clockwise, like lubrication will be more even while doing this maintenance. Perhaps one of the very experienced technicians who hang around here will comment. > If it > is Hayne's error and I have already done that, what should I do? Like I say above, I think you have done no damage to your car. > Will it > harm the belts ? Should I readjust the belt tension first ? No and no. > Very confused. > Many thanks for replying |
Re: clockwise/anticlockwise, very confused
Hello, thank you for your prompt replies..
The reason why I am confused is normal rotation for that engine is anticlockwise when facing the crankshaft pulley side, yet Haynes manual say to turn it clockwise for No.1, but anticlockwise for the rest; another confusing point is that they say you can use a remoter starter to turn the crankshaft until it is close enough to turn it manually, now if you use the remoter starter, then it has to be counterclockwise ?? The question is what to do about the timing belt which have been turned clockwise ? Don "Caroline" <caroline10027remove@earthlink.net> wrote in message news:6bMqc.1439$Tn6.57@newsread1.news.pas.earthlin k.net... > Short answer: The Hayne's manual directions are fine. > > "dpduff" <dpduff1@telusplanet.net> wrote > > Hi everyone, > > I am trying to adjust the valve clearance on a 90 Accord. Hayne's manual > > says to turn the crankshaft pulley clockwise to get at TDC on no. 1 cylinder > > and adjust the valves. > > Other manuals for circa early 1990s Hondas say just get the #1 cylinder at TDC > *without* specifying which direction one should rotate the crankshaft. > > See for example these directions for a 1991-1993 Accord, especially step 2: > > http://www.honda.co.uk/owner/AccordManual/400/5-14.pdf > > Also, for a circa 1990 Honda Concerto: > > http://www.honda.co.uk/owner/Concert...sk301/5-13.pdf > > And for a circa 1990 Prelude: > http://www.honda.co.uk/owner/Prelude...2sf100/5-8.pdf > > Also, the steps for removing the rocker arm on a 1990 Accord also have you > rotating the crankshaft so #1 cylinder is at TDC, but again no rotational > direction is specified. From the www.autozone.com site, see > http://tinyurl.com/2yjta > > While driving, the crankshaft pulley rotates COUNTERclockwise while standing > next to the front left wheel and looking across the engine to the passenger > side. When one is doing this maintenance, will it hurt to rotate the engine in > the clockwise direction? I can't really imagine how. The pistons move up and > down regardless. I can't think of a part in the crankshaft system that would be > hurt by rotating clockwise. > > I checked my car's valve clearances a few months ago for the first time. I think > you should just rotate the crankshaft manually in the direction that requires > the least amount of rotation to get #1 cylinder at TDC, per the description in > the manuals above. > > > To adjust no.3,4 and 2 valves, turn the crankshaft > > pulley anticlockwise. > > Correct. I think the only reason for this is simply that the correct firing > order is 1,3,4,2. Thus as the crankshaft rotates COUNTERclockwise 180 degrees, > the next valves that are correctly positioned for TDC are #3's. Another 180 > degrees, and #2's valves are correctly positioned for checking the valve > clearance. Etc. > > I trust you are aware that your car has a 4-stroke engine, so two revolutions of > the crankshaft occur to complete one cycle. During these two revolutions, each > cylinder fires exactly once. > > > Is it a typo error to turn the shaft clockwise ? > > Good question. Maybe there's some minor advantage to rotating first clockwise > and then counter clockwise, like lubrication will be more even while doing this > maintenance. > > Perhaps one of the very experienced technicians who hang around here will > comment. > > > If it > > is Hayne's error and I have already done that, what should I do? > > Like I say above, I think you have done no damage to your car. > > > Will it > > harm the belts ? Should I readjust the belt tension first ? > > No and no. > > > Very confused. > > Many thanks for replying > > |
Re: clockwise/anticlockwise, very confused
you use the remote starter to go clockwise just past, then manually back
counterclockwise. "dpduff" <dpduff1@telusplanet.net> wrote in message news:6yQqc.473$gx1.90@clgrps12... > Hello, thank you for your prompt replies.. > The reason why I am confused is normal rotation for that engine is > anticlockwise when facing the crankshaft pulley side, yet Haynes manual say > to turn it clockwise for No.1, but anticlockwise for the rest; another > confusing point is that they say you can use a remoter starter to turn the > crankshaft until it is close enough to turn it manually, now if you use the > remoter starter, then it has to be counterclockwise ?? The question is what > to do about the timing belt which have been turned clockwise ? > Don > "Caroline" <caroline10027remove@earthlink.net> wrote in message > news:6bMqc.1439$Tn6.57@newsread1.news.pas.earthlin k.net... > > Short answer: The Hayne's manual directions are fine. > > > > "dpduff" <dpduff1@telusplanet.net> wrote > > > Hi everyone, > > > I am trying to adjust the valve clearance on a 90 Accord. Hayne's manual > > > says to turn the crankshaft pulley clockwise to get at TDC on no. 1 > cylinder > > > and adjust the valves. > > > > Other manuals for circa early 1990s Hondas say just get the #1 cylinder at > TDC > > *without* specifying which direction one should rotate the crankshaft. > > > > See for example these directions for a 1991-1993 Accord, especially step > 2: > > > > http://www.honda.co.uk/owner/AccordManual/400/5-14.pdf > > > > Also, for a circa 1990 Honda Concerto: > > > > http://www.honda.co.uk/owner/Concert...sk301/5-13.pdf > > > > And for a circa 1990 Prelude: > > http://www.honda.co.uk/owner/Prelude...2sf100/5-8.pdf > > > > Also, the steps for removing the rocker arm on a 1990 Accord also have you > > rotating the crankshaft so #1 cylinder is at TDC, but again no rotational > > direction is specified. From the www.autozone.com site, see > > http://tinyurl.com/2yjta > > > > While driving, the crankshaft pulley rotates COUNTERclockwise while > standing > > next to the front left wheel and looking across the engine to the > passenger > > side. When one is doing this maintenance, will it hurt to rotate the > engine in > > the clockwise direction? I can't really imagine how. The pistons move up > and > > down regardless. I can't think of a part in the crankshaft system that > would be > > hurt by rotating clockwise. > > > > I checked my car's valve clearances a few months ago for the first time. I > think > > you should just rotate the crankshaft manually in the direction that > requires > > the least amount of rotation to get #1 cylinder at TDC, per the > description in > > the manuals above. > > > > > To adjust no.3,4 and 2 valves, turn the crankshaft > > > pulley anticlockwise. > > > > Correct. I think the only reason for this is simply that the correct > firing > > order is 1,3,4,2. Thus as the crankshaft rotates COUNTERclockwise 180 > degrees, > > the next valves that are correctly positioned for TDC are #3's. Another > 180 > > degrees, and #2's valves are correctly positioned for checking the valve > > clearance. Etc. > > > > I trust you are aware that your car has a 4-stroke engine, so two > revolutions of > > the crankshaft occur to complete one cycle. During these two revolutions, > each > > cylinder fires exactly once. > > > > > Is it a typo error to turn the shaft clockwise ? > > > > Good question. Maybe there's some minor advantage to rotating first > clockwise > > and then counter clockwise, like lubrication will be more even while doing > this > > maintenance. > > > > Perhaps one of the very experienced technicians who hang around here will > > comment. > > > > > If it > > > is Hayne's error and I have already done that, what should I do? > > > > Like I say above, I think you have done no damage to your car. > > > > > Will it > > > harm the belts ? Should I readjust the belt tension first ? > > > > No and no. > > > > > Very confused. > > > Many thanks for replying > > > > > > |
Re: clockwise/anticlockwise, very confused
always turn it counter-clockwise. going clockwise will put the slack
on the wrong side, not harmfull but it does affect tdc at the cam. got to tdc on #1 adjust them, then turn the crank 180 degrees counter and go for 3, repaeat for 4 and 2. Chip |
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