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Post by jayman8 on Feb 10, 2023 1:14:41 GMT 1
’m wondering if anyone here can help? I own a Citroen ds3 1.6 hdi 2014. I recently changed the water pump, timing and drive belts and set the tensioner on the timing belt wrong. Causing the bolt to snap and belt to be thrown against the belt covers (eating right through it in some places). The car cut out right away and I lost all power, no noise from the engine but the radio was on. I got towed home on a flat bed and began unbuilding the timing system finding out what I had done along the way. I ordered a new timing kit, extracted the snapped bolt and reset the timing using the holes on the fuel pump and crack/cam shafts. I fitted the new pullys and new belt set the tensioner properly this time after studying how they worked (complete fiddlesticks). Put everything back together and when I tried to start the car it almost goes, the starter engages and it gets right to the point where it almost ignites only for there to be a single clunk sound so I stop turning the car over.
When I try to crank the car by hand it becomes tight then releases as normal then it becomes engine mount bolt breaking strength to keep on turning?
Is it likely that the valves are bent?
Or is this more a piston problem?
My plan is to break it down to the head gasket to check things out
Learning hobbyist mechanic trying to pave a way forward an help would be great fully appreciated
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Post by remmington on Feb 10, 2023 7:55:25 GMT 1
Yes - worst nightmare. You have my deepest sympathy.
Valves will be bent for sure. Pistons should be OK.
Off with its head and photos please?
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spud
Apprentice
Posts: 1,284
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Post by spud on Feb 10, 2023 14:06:06 GMT 1
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Post by rhyds on Feb 10, 2023 17:53:08 GMT 1
If the belt failed while it was running then as Remmington says bad things will have most certainly happened and the head will have to come off to ascertain how badly the valves have hit the pistons.
I'm not sure, given your learning/skill level if its better for you to take the head off and see if its worth spending big money on a cylinder head rebuild or to ask a garage to do it. I'm sure one of the regulars can suggest the best course of action
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Post by remmington on Feb 10, 2023 18:09:57 GMT 1
Depending on engine code - these have lobes pushed on camshaft on splines (liek later VAG group cars) - other engine codes have hollow camshafts - tubes that deform. These "DV6" engines - there is such a mass array of them (they are fitted into everything). Without an engine code and "in depth" knowledge it is a guessing game (difficult to advise). Need photos...?
Post pics of the "carnage". |
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Post by OldGit on Feb 10, 2023 20:08:17 GMT 1
I have known these to be OK with a replacement camshaft if they failed at low revs, one or some of the lobes will have moved for sure. Unless you want to take the engine out, you'll need to remove the cylinder head to replace the camshaft, if you've been spinning it on the starter, it's very likely there will be one or more damaged valves, possibly valve guides. If your time is free, then it's not a horrendous cost, don't be tempted with bargain basement parts and learn how to lap valves in properly before you start - too much and you'll get a misfire, not enough and you'll get low compression. Don't chuck away the head gasket until you've confirmed the replacement is the same thickness, there are markings on the old one, usually a number of notches.
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Post by givusaclue on Feb 10, 2023 21:54:46 GMT 1
don’t think yo do need to remove the head to change the camshafts, thought they were clamped to the underside of the cam carrier.
remove injectors if they’re on top & then unbolt the carrier, the cams are linked by a chain & you can swap the carrier & cams as an assembly assuming it’s a 16v twin cam
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Post by OldGit on Feb 10, 2023 22:19:04 GMT 1
You could be right - thought the HDi was an 8V version with single camshaft, it's been a while and as pointed out, there are so many variants it's best to check against spec. or photos
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Post by remmington on Feb 11, 2023 7:41:52 GMT 1
You could be right - thought the HDi was an 8V version with single camshaft, it's been a while and as pointed out, there are so many variants it's best to check against spec. or photos +1 for this |
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