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25th June 2024, 10:10 | #1 |
Discount MG Rover Spares
Rover 75 CDTi, 2x MG ZS180 Join Date: Jun 2011
Location: Hythe, Southampton
Posts: 11,371
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Rough running K Series? Check your timing!
Our beloved Rover 25 CVT has always run a little rough from cold - in particular it was a little 'bouncy' (for lack of a better term), feeling like it'd been filled with kangaroo juice along with quite a lot of hesitation at junctions.
Initially I put this down to the CVT gearbox - however the most I thought about it, the more I realised this would likely be something engine-related. I checked all sensors; all OK apart from an out-of-spec pre-cat Lambda sensor. I replaced this which did help the rough idle and seemed to smooth things out a little, but it still wasn't quite right. Taking a chance, I decided to remove the timing belt covers and was greeted with the scene in the first 2 pictures below - quite clearly a good deal away from being timed properly! Picture 3 shows how the timing marks should align on the crankshaft pulley - the ridge on the oil pump should sit between the two dots. Interestingly, the garage that'd charged the previous owner a rather large amount for the head gasket work carried out a couple of years ago had fitted a 5PK1145 auxiliary belt - this is far too short, and meant the tensioner was 'bottomed out' (making removal a real pain!) We fitted the correct PQS101590 item and everything seems to work as it should with no lasting damage. Needless to say, the car is a lot happier now - the 'bouncing' has completely gone, as has the hesitation when applying throttle. If your K Series has similar issues, it may be worth checking your timing - it doesn't take long to do, and as usual the K Series is a joy to work on even with only relatively basic tools to hand.
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25th June 2024, 18:25 | #2 |
Gets stuck in
75 Saloon Join Date: Apr 2022
Location: North Somerset
Posts: 610
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A useful write up for any K Series owners with rough running!
I did my first head gasket and timing belt on our 1.4 Rover 25 a couple of months ago and, one or two slightly awkward bolts aside, it was indeed a pleasure to work on.
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Matt 2001 Rover 75 Connoisseur SE 2.5 (BRG) 1999 Rover 75 Club 2.5 (Dorchester Red) 1973 Triumph Dolomite (Honeysuckle) |
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