timing chains..
timing chains..
ive noticed on a lot of ads recently that engines are being fitted with timing chains, so they don't need changing.. i worked for a chap who had one go on his trafic, it was an expensive day for him..
Re: timing chains..
What, don't need changing like the BMW & Audi ones that break, and the Nissan ones that stretch and the resulting difference in the crank and cam sensors put the engine into limp mode? If they used a decent chain they'd probably be OK, but you wouldn't want one of the new ones on a pushbike.....rich. wrote:ive noticed on a lot of ads recently that engines are being fitted with timing chains, so they don't need changing.. i worked for a chap who had one go on his trafic, it was an expensive day for him..
Currently over 35 years worth of fixing 35 boxes.
Hoping to reach 65 years worth of fixing 65 boxes.
Hoping to reach 65 years worth of fixing 65 boxes.
- Grumpy Northener
- Posts: 1637
- Joined: Sun Apr 03, 2011 8:26 am
- Location: Hampshire UK
Re: timing chains..
My Navara was always doing this - the dealer always said it never it did for them when on road test at one point they had the motor for 3 weeks purely on road test and never found the problem eventually the timing chain let go and the engine was dead at 65,000 miles !and the Nissan ones that stretch and the resulting difference in the crank and cam sensors put the engine into limp mode
1937 Jowett 8 - Project - in less pieces than the Jupiter
1943 Jowett Stationary Engine
1952 Jowett Jupiter - In lots of peices http://Jowett.org/
1952 Jowett Javelin - Largely original
1973 Rover P6 V8 - Original / 22,000 miles
1943 Jowett Stationary Engine
1952 Jowett Jupiter - In lots of peices http://Jowett.org/
1952 Jowett Javelin - Largely original
1973 Rover P6 V8 - Original / 22,000 miles
Re: timing chains..
Mercedes Benz have always used timing chains. The single row chains will break, double row chains are less likely to but the guides are made from plastic and can break over time. If they do, the chain will jump time and result in valves colliding.
Single row chains were good for about 40k miles, double row are good for about 100k miles.
Ford 300 straight six motor had the solution with timing gears.
Single row chains were good for about 40k miles, double row are good for about 100k miles.
Ford 300 straight six motor had the solution with timing gears.
Re: timing chains..
A safe head is the only absolute solution, but even then, with the fibre toothed camshaft gears on the Ford Koln and Dagenham V4 & V6 and the IL4 and IL6 found in Volvos up to - in the case of the 4 - the early 240s which still came with the old pushrod engines, a little knocking sound that appears endy but happens on load will begin so gently that the temptation will be to ignore it, then the distributor will cease to be driven, the valves will stop where they are and black smoke will close both lanes of the southbound A1M for two whole hours while the driver of the stricken [Volvo 142S] explains, red faced, to the fire crew why exactly his car had created this environmental disaster and that no, thanks fellas, the car is not on fire and the RAC are coming with a pair of gears, a sump gasket and the correct tool to pull the fihre gear onto the camshaft without punching the core plug out the end of the block.alabbasi wrote:....Ford 300 straight six motor had the solution with timing gears.
Right enough though, if you were fitting a steel camshaft gear to a B20, it would probably be the least likely engine of all time to fail its camshaft drive. But the steel conversions were hellish noisy and not as cheap as factory mixed pairs and the oil pump would still have its fibre gear..
Whereas the belt on a typical modernish engine can be changed in ten minutes if you leave half of the old one in place to guide the new belt in and most petrols are safe, nearly all Japanese ones are, they leave the chains for the interference engines.. But strangely not for the hardest to reach Diesels.
J
"Home is where you park it", so the saying goes. That may yet come true..
"Home is where you park it", so the saying goes. That may yet come true..
Re: timing chains..
Din;t need changing?
Tell that to all the owners of A-Series engines with rattling timing chains .. because they have stretched ..
OK less likely to break than a belt but then again belts tend not to snap but the tensioners seize and take the teeth off .. just like this in fact ..
Tell that to all the owners of A-Series engines with rattling timing chains .. because they have stretched ..
OK less likely to break than a belt but then again belts tend not to snap but the tensioners seize and take the teeth off .. just like this in fact ..
"If you're driving on the edge ... you're leaving too much room!"
Retirement Project: '59 Austin A35 2-door with 1330cc Midget engine and many upgrades
Said goodbye: got '98 Alfa Romeo 156 2.0 TSpark to 210K miles before tin worm struck
Retirement Project: '59 Austin A35 2-door with 1330cc Midget engine and many upgrades
Said goodbye: got '98 Alfa Romeo 156 2.0 TSpark to 210K miles before tin worm struck
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