hi, i want to upgrade my timing chain to one of those duplex ones, is this a hard job, like can it be done with the engine in the car? also, will i need to re-time the engine after?
thanks
adam
Timing Chain
Started by
mini mad adam
, Feb 17 2006 10:12 PM
3 replies to this topic
#2
dklawson
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Posted 17 February 2006 - 10:24 PM
It can be done in the car. I'm not sure what special steps you'll need on an A+ engine. I know on early A-series it was necessary to replace the hex head fasteners holding the front engine plate on by counter-sinking the plate and installing flat head screws. I also don't know what you do regarding the chain tensioner on the later type covers. I'm sure others can elaborate.
Perhaps the most important thing when doing this with the engine in the car is pay attention to centering the crank seal (mounted in the cover) on the crank. There are various methods but the way I was most satisfied with involved using a homemade spacer ring and installing the seal after the cover was bolted on. This is not the procedure listed in the manuals.
The sprockets have alignment dots on them and when you put the new chain/sprockets on you'll be close with the valve timing. During a complete rebuild you'd measure this with indicators and a degree wheel followed by correcting any errors with adjustable pulleys or offset keys. Now I'm talking about valve timing because the cam is coupled to the crank through the chains and sprockets. Since the cam drives the dizzy through another gear, any changes in your timing chains/sprockets should be followed by checking and resetting the ignition timing as well.
Perhaps the most important thing when doing this with the engine in the car is pay attention to centering the crank seal (mounted in the cover) on the crank. There are various methods but the way I was most satisfied with involved using a homemade spacer ring and installing the seal after the cover was bolted on. This is not the procedure listed in the manuals.
The sprockets have alignment dots on them and when you put the new chain/sprockets on you'll be close with the valve timing. During a complete rebuild you'd measure this with indicators and a degree wheel followed by correcting any errors with adjustable pulleys or offset keys. Now I'm talking about valve timing because the cam is coupled to the crank through the chains and sprockets. Since the cam drives the dizzy through another gear, any changes in your timing chains/sprockets should be followed by checking and resetting the ignition timing as well.
#3
vasi
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Posted 17 February 2006 - 10:25 PM
This is a straightforward job, and you don't need to take the engine out. The biggest issue you are likely to face is having the right size socket to remove the bolt from the crank. You shouldn't need to retime the crank, but it's a good idea to check the cam timing is set right while you are there.
Goddamit, it must be national double-post-at-the-same-time as everyone else day today.
Goddamit, it must be national double-post-at-the-same-time as everyone else day today.
#4
miniman.matt
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Speeding Along Now
Posted 18 February 2006 - 10:24 AM
on the later engines there is a bump inside the timing cover that needs to be nocked out as the duplex gear fouls on this. 
make sure you do this or you will make a hole in the thin cover and have oil everywere 
make sure you do this or you will make a hole in the thin cover and have oil everywere
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