Timing 180* off
06-12-2012, 11:21 PM
#21
Senior Member
Thread Starter
iTrader: (8)
Join Date: May 2011
Location: Granbury, Tx
Posts: 813
Total Cats: 14
I am going to check more tomorrow while I have daylight. But to me it seems it has slipped. My jaw dropped when I saw how far my marks were off, made me thing my plugs were swapped or some odd end thing, but couldn't be because the car runs like a champ.
Joe, any suggestions on sites for a new pulley?
Joe, any suggestions on sites for a new pulley?
Reply
0
0
06-12-2012, 11:27 PM
#25
Boost Pope
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,052
Total Cats: 6,615
Well, I was going to say Rosenthal, but then I noticed how much they want for one.
Does anybody remember what year RicanRacer's car is? You could maybe just steal the crank pulley off of his engine.
... says the Man with Two Anuses.
Does anybody remember what year RicanRacer's car is? You could maybe just steal the crank pulley off of his engine.
... says the Man with Two Anuses.
Reply
0
0
06-12-2012, 11:28 PM
#26
Senior Member
Thread Starter
iTrader: (8)
Join Date: May 2011
Location: Granbury, Tx
Posts: 813
Total Cats: 14
I have always thought it didn't back when I owned my NB, I know it's not a NA engine but my readings made me believe it never happened. Those were in the spec miata days, I have joined the dark side? or whatever side you guys are on
Reply
0
0
06-12-2012, 11:31 PM
#27
Senior Member
Thread Starter
iTrader: (8)
Join Date: May 2011
Location: Granbury, Tx
Posts: 813
Total Cats: 14
Yeah I am on a budget as of right now, well I say budget but I plan to push this build throughout the year slowly buying parts/goodies. I blow all my paychecks on my car and my dirt track car so having 2 things running is tough. I am sure most of you guys can relate.
Reply
0
0
06-12-2012, 11:36 PM
#30
Its very common on pre 93 models however on our models it will still happen if the crank is not tightened properly. The pulley will be able to turn little by little and wear down the crank. On my 97 NA (had only 90k miles on the odometer) thats what happened. The crank was worn about an extra 1/8th where the keyway was and also the pulley was wobbling enough to the point where the belts would come off.
Reply
0
0
06-12-2012, 11:40 PM
#31
Senior Member
Thread Starter
iTrader: (8)
Join Date: May 2011
Location: Granbury, Tx
Posts: 813
Total Cats: 14
Its very common on pre 93 models however on our models it will still happen if the crank is not tightened properly. The pulley will be able to turn little by little and wear down the crank. On my old NA thats what happened. The crank was worn about an extra 1/8th where the keyway was and also the pulley was wobbling enough to the point where the belts would come off.
I need to find a good used one for a good price. I reused mine when I rebuilt my engine but I put a new woodruff key in, but it still slightly wobbles. The made sure I tightened the **** out of it but didn't want to get it to tight. Father thinks the crank wobbles until I told him the pulleys are known to go bad.
Reply
0
0
06-12-2012, 11:49 PM
#33
Senior Member
Thread Starter
iTrader: (8)
Join Date: May 2011
Location: Granbury, Tx
Posts: 813
Total Cats: 14
I would figure if the crank was bad the pulley would still wobble when I raise my rpms, the pulley straightens out and seems normal when given some gas. Only at idle does it have that slight wobble to it
Reply
0
0
06-12-2012, 11:59 PM
#34
Boost Pope
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,052
Total Cats: 6,615
Yeah, we need to remember that there are two very distinct failure modes here. The "short nose failure" is usually caused by the crank bolt being improperly torqued, and involves the keyway in the cambelt gear and / or pulley boss becoming deformed by the woodruff key. This can destroy not only the gear/boss, but also the crank itself.
Slippage of the pulley itself has no specific cause in negligence, it just happens as the stuff gets old. It causes no serious mechanical damage to the engine, you just wind up with a pulley that slips further and further out of true until it finally splits completely in half early one morning while you're merging onto the freeway in heavy traffic in the rain while running late for a court appearance.
Slippage of the pulley itself has no specific cause in negligence, it just happens as the stuff gets old. It causes no serious mechanical damage to the engine, you just wind up with a pulley that slips further and further out of true until it finally splits completely in half early one morning while you're merging onto the freeway in heavy traffic in the rain while running late for a court appearance.
Reply
0
0
06-13-2012, 12:12 AM
#35
Senior Member
Thread Starter
iTrader: (8)
Join Date: May 2011
Location: Granbury, Tx
Posts: 813
Total Cats: 14
Yeah, we need to remember that there are two very distinct failure modes here. The "short nose failure" is usually caused by the crank bolt being improperly torqued, and involves the keyway in the cambelt gear and / or pulley boss becoming deformed by the woodruff key. This can destroy not only the gear/boss, but also the crank itself.
Slippage of the pulley itself has no specific cause in negligence, it just happens as the stuff gets old. It causes no serious mechanical damage to the engine, you just wind up with a pulley that slips further and further out of true until it finally splits completely in half early one morning while you're merging onto the freeway in heavy traffic in the rain while running late for a court appearance.
Slippage of the pulley itself has no specific cause in negligence, it just happens as the stuff gets old. It causes no serious mechanical damage to the engine, you just wind up with a pulley that slips further and further out of true until it finally splits completely in half early one morning while you're merging onto the freeway in heavy traffic in the rain while running late for a court appearance.
Reply
0
0
06-13-2012, 12:23 AM
#36
Yeah, we need to remember that there are two very distinct failure modes here. The "short nose failure" is usually caused by the crank bolt being improperly torqued, and involves the keyway in the cambelt gear and / or pulley boss becoming deformed by the woodruff key. This can destroy not only the gear/boss, but also the crank itself.
Reply
0
0
06-14-2012, 08:17 PM
#38
Moderator
iTrader: (12)
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 20,668
Total Cats: 3,015
Somebody on here has an extra dampner pulley for you. It is an oft overlooked piece when cars and engines are parted out. Start asking people in the for sale section.
And yes, this is definitely the dark side. This forum has a bit of a reputation for both technical prowess and devilish insidiousness.
And yes, this is definitely the dark side. This forum has a bit of a reputation for both technical prowess and devilish insidiousness.
Reply
0
0
