924Board.org

co · Joined: 24 Mar 2006 Posts: 24 Location: guildford uk

hi i need to change my belts . i done lots of jobs myself new front shocks, new seals in oil cooler,changed rocker gasket,front wheel bearing,so i hav a go. is any one out there that fits own belts ,if so any tips and advise would be great.cheers ,chris
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924S le mans 88

joecitizennn · Joined: 12 Sep 2005 Posts: 2096 Location: no mans land

I suppose you mean timing belts. And the answer is yes, lots of people here change their own including myself. You can get yourself into long arguments over just HOW it should be done. THere is the party that wants to spend 1500 to have a certified mechanic do it and tells everyone else they are stupid to risk doing it on their own. There is the party that spends an arm and a leg on "genuine porache" parts (if there is such a thing) and the original 400 dollar plus tension tool, and they say people are stupid not to use the porshce tool and porsche parts, and people are stupid for taking it to a mechanic to do it when they could buy the tool themselves. Then there is the group who uses alternative tensioning tools and cheaper locally found parts that say everybody else is stupid for sinking 1000s of dollars into a car not worth much more than 3 or 4 thousand dollars. WHo is right? Well nobody of course.

So, what am I saying? Doing a timing belt job is not hard at all. Attention to detail will get you through it fine. As far as parts and tools, that is up to you. You can do the entire job including idlers, belts, re-man waterpump and front engine seals for about the price of a porsche water pump if you do the ebay route. Or you can spend a whole lot more and get it all from porsche to make yourself feel better.

By the way, I have a 1988 Lemans american version. It would be reallt great if you could post some pics of your car for everyone to see. We dont get to see the euro versions very often.

co · Joined: 24 Mar 2006 Posts: 24 Location: guildford uk

thanks for that joe,it gave me the conferdance to get stuck in and all went well ,what interest me ,i started and reved up too 4000 revs with out the balance belt on to see how much the balance shafts smoth the engin. i could hardly tell the differance?.about photos i have no way of sending them,but if you go on pistonheads loads of uk spec and some times le mans for sale. thanks, co.
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924S le mans 88

joecitizennn · Joined: 12 Sep 2005 Posts: 2096 Location: no mans land

bcblase · Joined: 23 Oct 2007 Posts: 574 Location: Winchester, VA

My balance belt was off by a good 30 degrees (10 teeth) and getting it right made huge difference in engine vibration, especially around 4-5k RPMs.

Porsche designed the balance shafts for reason - they work!

Brad
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1987 Porsche 924S - track toy
1986 Mercedes 190E 2.3-16v - autocross
2007 F-150 5.4L Lariat Supercrew - tow beast
1994 Volvo 850 Race Wagon - 24 Hours of Lemons Car
2001 BMW 325xi - daily driver

joecitizennn · Joined: 12 Sep 2005 Posts: 2096 Location: no mans land

Khal · Posted: Wed Nov 18, 2009 6:46 am Post subject:

gohim · Joined: 02 Nov 2002 Posts: 4459 Location: Rialto, CA

No, Mitsubishi holds a patent for counter rotating shafts to balance vibration. Porsche chose to pay Mitsubishi a per unit manufactured royalty to avoid a patent infringment lawsuit.

Porsche designed the entire 2.5L engine inhouse.

co · Joined: 24 Mar 2006 Posts: 24 Location: guildford uk

i think a man called Lancester invented balance shaft thingmegigg in the 189?. co
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924S le mans 88

Khal · Posted: Thu Nov 19, 2009 4:29 am Post subject:

Mav666 · Joined: 16 May 2008 Posts: 47 Location: Newcastle, UK

Only thing I could add is check the tension after a couple/few hundred miles, I had a small shudder around 3k after a short while just needed the balance belt tighten a little after that its been perfect