Much smoke!?! Oil leak in engine bay; were to start looking?
#21
Technically you can remove the upper tensioners without removing the chains. However it involves removing the caps from one of the camshafts and lifting it slightly, specifically the camshaft not connected to the primary chain. Chains stretch over time so if you are replacing the tensioners might as well replace the chains too. I'd rather take care of it all and not worry about it for 100K then have to break back in earlier to replace the chains too.
Last edited by anduha; 10-22-2020 at 04:08 PM.
#22
Fixing stuff that isn’t broken and can’t cause serious damage is typical jag owner behavior. I’ve worked on Ford mod motors (same exact chain setup) that were running for thousands of miles on completely busted guides. Only replace the secondary tensioners and nothing else, it takes two hours start to finish. Leave the primary chain alone unless you can hear it slap or rattle on startup.
https://www.ebay.com/itm/173051386756
https://www.ebay.com/itm/173051386756
Last edited by xalty; 10-22-2020 at 05:54 PM.
#23
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Remove the bearing caps from the exhaust cam and lift the cam to relax the chain. You can use two plastic tie wraps around the secondary timing chains to ensure they don't change timing.
Once the new tensioner is in place, refit the cam bearing caps in the correct order and torque them to specification, then remove the plastic tie wraps.
When refitting the cam covers, make sure to add some gasket sealant, about 10mm or so, to the areas on each head where the timing cover meets the cylinder head. DO NOT use gasket sealer anywhere else on the cam covers.
Once the new tensioner is in place, refit the cam bearing caps in the correct order and torque them to specification, then remove the plastic tie wraps.
When refitting the cam covers, make sure to add some gasket sealant, about 10mm or so, to the areas on each head where the timing cover meets the cylinder head. DO NOT use gasket sealer anywhere else on the cam covers.
#24
Fixing stuff that isn’t broken and can’t cause serious damage is typical jag owner behavior. I’ve worked on Ford mod motors (same exact chain setup) that were running for thousands of miles on completely busted guides. Only replace the secondary tensioners and nothing else, it takes two hours start to finish. Leave the primary chain alone unless you can hear it slap or rattle on startup.
https://www.ebay.com/itm/173051386756
https://youtu.be/Z5NHVfiyFpU
https://youtu.be/ECC69nXv3N4
https://www.ebay.com/itm/173051386756
https://youtu.be/Z5NHVfiyFpU
https://youtu.be/ECC69nXv3N4
If your budget is tight or you are short on time I get it, just the secondary tensioner fix will last for a long while.
#25
Fixing stuff that isn’t broken and can’t cause serious damage is typical jag owner behavior. I’ve worked on Ford mod motors (same exact chain setup) that were running for thousands of miles on completely busted guides. Only replace the secondary tensioners and nothing else, it takes two hours start to finish. Leave the primary chain alone unless you can hear it slap or rattle on startup.
The cam covers usually leak at the lower rear corner where the oil collects, I usually use a little RTV on the gasket in those corners and have never had repeat problems.
Last edited by kansanbrit; 10-23-2020 at 10:58 AM.
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