There is documentation that details the changes, schematic engine drawings, can’t put my hands on it this mo. They were originally all belt/belt (turbo at front) and now if you have sense they are to be AVOIDED out of warranty . This engine is fitted to all 1.0 MK3 Focus, ecosport, Fiesta and some vans. Then they introduced a chain cam version with a gear driven oil pump (seems short lived) and not sure if this was in early Puma’s and it might have been 1.5 only? Then they moved the oil pump which resulted in it going back to being belt driven, so a chain/belt engine, ( turbo at rear). All versions have been along side each other, one didn’t directly replace the other.Fairly certain the chain/belt version is in the Puma’s now.P6Baseunit wrote: ↑Tue Jan 30, 2024 8:07 pmHi there,
Can I ask why you think the oil pump is driven by a wet belt?
Serious question - as it seems odd to me that they would move the cam to being chain driven and still have a wet belt that will need changing for the oil pump.
This alters my view on how long I might keep the car for example.
There is no information or evidence that the Puma engines until fairly recently have the modified tensioner or improved oil pump belt construction, that improvement is recent as Ford have only recently acknowledged the issue and presented the upgrades. It is not known if the chain/belt engine will have the same issues as the belt/belt engine, they are generally still too new. I feel about 50/50 with the 1.5 in our ST. No failures have been reported on the 1.5’s yet, all have been on 1.0’s and belt/belt versions. However it is the oil pump failing that initiates the ultimate catastrophic failure.
Modern engines and cars are built with minimal cost in mind, they are proving far less robust as engines of the past, lasting not far beyond warranties in some cases and it’s not just Ford although they’ve had a couple of disasters lately including the the 1.5/6 4cylinder ecoboost which are at least as bad as the 1.0. But many reports of the PSA 1.2’s failing too with timing chain stretch issues, timing chains don’t necessarily mean reliable! JLR for one of many have just proven that with their disastrous 2.0 Ingenium Diesel, probably the worst modern example of how to get an engine wrong and it’s all about timing chain, guide snd tensioner failures.