M42club.com - Home of the BMW E30/E36 318i/iS
DISCUSSION => Engine + Driveline => Topic started by: KenC on August 29, 2008, 10:31:03 PM
-
So what's the risk of running cam and crank gears that are worn? Mine are worn a bit and I'm putting in a new chain this weekend. I don't see how it could ever jump a tooth or anything.
-
nobody ever does......
post pics
-
i wondered the same thing as i just got an m42(175kmiles) swap and want to refresh the timing chain, tensioner and rails, but cant find the sprockets on BMA, Pelican or germanautoparts. they are a little bit worn, just on the edges, chain is tight, very little play when the crank is turned.
anyone know where to buy the sprockets? otherwise im not gonna worry about it either....
-
Pelican Parts will have the sprockets, give me your vehicle details and I will look it up for you through RealOEM.
-
So it's play in the chain that's the main concern with worn teeth? Premature wear on the chain is the issue?
-
well your chain is not going to be matched to your sprockets
-
Pelican Parts will have the sprockets, give me your vehicle details and I will look it up for you through RealOEM.
1991 318i m42
i found the tensioner sprocket on http://www.bestpricecarparts.com , but no cam or crank sprockets.
-
I didn't think my cam gears were worn either, but I think they were a main reason my timing chain assembly sounded the way it did.. When I took em off they were really sharp looking, and the new ones had an almost squared end on each tooth lol needless to say I'm happy I got the cam gears as well as the crank gear... I got mine from bma,, call patrick and he'll hook ya right up :)
-
if ican get the part nukbers i can search for them on the BMA site. perhaps ill tryin get them off the motor, cam sprokets i can see, the crank sprocket light take a day or 2.
-
http://www.esatclear.ie/~bpurcell/318istimingchain.html
-
Here are the part numbers for the parts you require. Type them into the Pelican Parts Search and you can then add them to the cart.
1991 318i E30 M42
Crankshaft sprocket - 11-21-1-247-338-BOE - $61.00 (1x req)
Camshaft sprocket - 11-31-1-721-887-BOE - $48.25 each (2x req)
Seeing as you have found the idler sprocket on http://www.bestpricecarparts.com I would buy it from there as it is only $61.70 compared to Pelican Parts $133.50, your saving big time. And also the above parts are special order - no refund, and have about a week waiting time. For looking up part numbers, check out RealOEM.com for future reference. Once you have the part no. just type it into the Pelican Parts search and it will come up unless that part has been discontinued.
-
heres what my cam gears look like click (http://nicktenhulzen.com/new318/DSC00892.JPG) on a junkyard engine i just picked up to try and get my car running so i can drive down to school in a couple weeks. Yes the whole idea is sketch but i think that these gears are looking pretty good. Engine supposedly has like 125k on it. how many miles does yours have and what do they look like?
-
heres what my cam gears look like click (http://nicktenhulzen.com/new318/DSC00892.JPG) on a junkyard engine i just picked up to try and get my car running so i can drive down to school in a couple weeks. Yes the whole idea is sketch but i think that these gears are looking pretty good. Engine supposedly has like 125k on it. how many miles does yours have and what do they look like?
Those gears actually look really good,, that's what my new ones looked like.. the ones in there were a point,, sharp as a knife lol good find on that motor :) whatd you pay for it?
My engine ticked 197k when I finally got to replace everything.. next is clutch, 19# injectors, hose replacement with valve cover gaskets... should hopefully get another 100k out of it after that :D
-
yeah i figure if it lasts 100 miles it will last 100k miles. I think some of it might be to do with the year though. I bet that the gears were all once pointy then they revised the part.
I got it for 700 with a 90 day warranty, and it came with all the e36 manifolds and the full wiring harness.
edit, check out the assembly for 09/93 cars and up
http://www.realoem.com/bmw/showparts.do?model=BE63&mospid=47480&btnr=11_1370&hg=11&fg=25
-
I have been having the same timing, chain slipping problem...I put everything back together and TDC everything. On start car idles then dies, what ever the case seems like the chain keeps slipping, all parts look good...but everything looks good covered in oil. Anyone in the tri-state area good with m42 timing etc., and willing to replace all parts form ???
-
Your chain is slipping? How?
-
Truthfully I have no idea...but after I TDC everything, and start the engine it either starts and I have to rev it to stay on, or the car dies...then it wont start after that. Or it starts and if I rev it....it dies...and wont start again. So, I am guess the timing keeps going bad, so the chain is slipping..
-
Truthfully I have no idea...but after I TDC everything, and start the engine it either starts and I have to rev it to stay on, or the car dies...then it wont start after that. Or it starts and if I rev it....it dies...and wont start again. So, I am guess the timing keeps going bad, so the chain is slipping..
You're sure it's not a lack of spark or fuel?
-
my sprockes WILL be getting changed:
(http://www.motorgeek.com/phpBB2/gallery2.php?g2_view=core.DownloadItem&g2_itemId=76099)
-
my sprockes WILL be getting changed:
(http://www.motorgeek.com/phpBB2/gallery2.php?g2_view=core.DownloadItem&g2_itemId=76099)
1. If you adjust those bolts on the sprocket (4 slotted bolts), I am guess it advances your timing, or retards your timing...depending on which way you turn true?
2. If you change your sprockets, then you will be removing those bolts, so do you have to remember the mark and set back properly?
-
1.) thats correct. TRUE
2.) yes, i must put the new sprockets back in the same spot as the old ones.
but im gonna mark the camshaft right under the timing arrow on each one, and put the new sprockets on those marks. shouldnt be too terrible.
-
IMO The main reason for changing the sprockets would be to reduce noise, especially the zizzing sound commonly heard around 3000rpm. If you're doing it for that reason you'd do well to change the chain guides and tensioner as well.
I changed all but the idler gear, as it's not driven and doesn't drive anything. I have heard though on higher mileage engines, the casting which supports the idler can suffer cracking. Worth checking while you're in there.
As for a chain slipping, that would have to be some seriously worn sprockets or guides!
-
My thoughts exactly re: the slipping/tooth jumping. With my new rails/guides and tensioner, there is no way in hell it could jump a tooth.
IMO The main reason for changing the sprockets would be to reduce noise, especially the zizzing sound commonly heard around 3000rpm. If you're doing it for that reason you'd do well to change the chain guides and tensioner as well.
I changed all but the idler gear, as it's not driven and doesn't drive anything. I have heard though on higher mileage engines, the casting which supports the idler can suffer cracking. Worth checking while you're in there.
As for a chain slipping, that would have to be some seriously worn sprockets or guides!
-
I have been having the same timing, chain slipping problem...I put everything back together and TDC everything. On start car idles then dies, what ever the case seems like the chain keeps slipping, all parts look good...but everything looks good covered in oil. Anyone in the tri-state area good with m42 timing etc., and willing to replace all parts form ???
Did your woodruff key on your crankshaft fall out when you replaced the sprocket?