Hi guys, It has been brought to my attention that there have been a couple issues lately regarding to timing belts and timing issues in general. We have noticed a problem with some standard style aftermarket belts which for some reason seem to be losing timing. What have found is that non genuine belts seem to be a fraction longer than the original. Not in the way that it has more teeth but the gap between each tooth is fractionally larger than standard, which means over the entire length of the belt, 2 or 3mm is added to the overall length, but invisible to the naked eye when a brand new aftermarket belt was held next to a brand new genuine belt. We then fitted both of these belts on a VG30 with all the marks correctly lined up and turned the crank by hand 10 full revolutions. The genuine belt stayed true and all cams were spot on when the crank was lined up, however, when the same was done to the non genuine belt the cams had "crept" a full tooth which means that the CAS would need to be overly adjusted to give the desired amount of 15 degrees. We repeated this twice with each belt just to be 100% sure this was the case. We advise to all those who are getting their timing belts done to buy/request the use of GENUINE Nissan timing belts only. To all those who might be concerned, I have never supplied an aftermarket belt, only genuine Nissan belts. Emmanuel.
thanks for heads up! can you by any chance give us the brand and model number of the offending belt(/s)?
Thanks Emmanuel That explains my issue I guess it all goes to show how important getting a proper 100,000km service is. I've read the post about Chapman and Chapman by A-Briz-Z and I've had a similar experience where the water pump wasn't replaced etc... All up I have spent around $1,800 - $2,000 on the initial alleged '100,000km' service and the consequent fixing of things that weren't done.
Re: What brand(s) were to blame? The one that was supplied by the nissan dealer was a Gates belt last time I bought one. There are only 3 types on the market DAYCO, Gates and OEM, What one is wrong Emmanual ??
Maybe maybe not I doubt if this is the case if Gates belt as they make belts for OEM and Tomei, Nismo, Power Enterprise, Greddy etc. I have sent email to supplier to check though to be sure. If it is correct then line up for class action. Dayco don't know about tehm.
Re: What brand(s) were to blame? I fitted a Gates belt and haven't had a problem. However in the past we've had problems with people that buy a timing belt based on the teeth and width figure. ie, there belt is 106teeth x 25mm wide so they find a belt in the gates book those measurements and assume it is right.. They're wrong. In Australia there are 10 different style of teeth (By Gates) which vary by shape, distance between the teeth and I'm sure other things. I have always supplied the Gates belt that is listed for whatever type of vehicle it is and never have a problem. Gates warrant their product against failure for whatever the vehicle manufacture says.. ie. toyota camry's only have to have the t-belt changed every 150,000k's. I doubt very much that there would be a problem with any Gates belts.. Cheers, Will
timing belts like others have said the OEM belt and the gates belt is the same... i got a gates belt part number is T180.. GJ saw it a few weeks back when i went to pick up some parts from his place no way in hell was i going to pay over $100 for an "OEM" belt that is just the same as buying the gates belt with gates on it. Nath
Timing belt I just didn't want to target specifically one brand of non genuine belt, but am suggesting the use of a OEM spec belt. Seeing that Gates makes the original Nissan belt there is no real reason why you could'nt use one of those either.
Re: Timing belt Is the 'unnamed' belt specified for Z32 application? I assume you are referring to the pitch (I think it's referred to) being different to OEM/Gates. I've found this b4 in different applications, however, clarification re the unnamed brand would be appreciated.
conservative as i am, i am inclined to go with malc... it seems we do not have particular problems identifying problem brands in other areas of zed maintenance .. should we not folow suite in this case ..????:unsure::unsure::unsure::unsure:
worst case a 3mm longer timing belt equates to 2.75 degrees >> In the worst case scenario you would have the 3mm extra length between the crank sprocket and cam sprockets. This means the cam sprockets would be able to turn another 3mm clockwise relative to the crank. The cam sprockets are 125mm diameter which means the distance around the sprocket is 392mm. So, if the cam sprockets move 3mm then that is equal to the cam sprockets rotating 360 degrees * 3mm / 392mm = 2.75 degrees Since the CAS and cam sprocket is relative to the crank means that rotating the CAS by one degree is equal to 2 degrees at the crank hence the 2.75 degrees above would equate to the CAS being an additional 1.4 degrees out from standard (which is usually center of the CAS slot).
