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18th August 2018, 18:49 | #1 |
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MG ZT 190+ (Development car), mg zt 190SE (Twilight), MG ZS 180 Join Date: Nov 2017
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MG ZT 190PS with 180 (177) timing is thus possible
Hi there
Has anyone heard of this happening before? I have a 2004 2.5 v6 190 plus MG ZT and I am just in the process of changing the timing belts on the car , it’s all stripped back ready to do.. I have just gone to put the locking tools in place before removing the belt to check alignments , and found the timing seems to be set for the locking 180 plates and not the 190 plates. Also the rear cam belts seem to be slightly out as well. Has anyone heard of this before and likewise is there anyway of checking the engine to confirm it is a 190 or 180 unit. It is the original engine, and I am sure stranger things have happened during manufacturing previously. If it is just a previous error then I take it re aligning from scratch will resolve the problem, likewise if I set it up for the 190 timings and then subsequently find out it is 180 engine, will I do any damage to the engine? Any help most appreciated. Matt |
18th August 2018, 19:03 | #2 |
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MG ZT260 SE, MG ZT190+, MG ZTT 160, R75 Conn SE 2.0, R75 Conn SE 2.5 X 3, R75 Club SE 1.8, P5B Coupe Join Date: Jul 2009
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Could it be that the engine (or just cylinder heads) in your 190 has been replaced with that/those from a 180 (auto) at some point I wonder?
(a 180 is just a detuned 190 for the autobox as far as I recall) Last edited by mh007; 18th August 2018 at 19:06.. |
18th August 2018, 19:13 | #3 |
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What is the engine number code?
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18th August 2018, 19:26 | #4 |
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18th August 2018, 19:34 | #5 |
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MG ZT 190+ (Development car), mg zt 190SE (Twilight), MG ZS 180 Join Date: Nov 2017
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Thanks for the info so far, most appreciated
I am not aware that the heads have ever been changed, in fact I am under the illusion from the 2 previous owners that the timing belt has never been changed at all. The engine number is 25k4fp58 253867 |
18th August 2018, 22:42 | #6 |
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MG ZT260 SE, MG ZT190+, MG ZTT 160, R75 Conn SE 2.0, R75 Conn SE 2.5 X 3, R75 Club SE 1.8, P5B Coupe Join Date: Jul 2009
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25K4FP58 is a 190 (manual trans) so it is the correct engine according to that.
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19th August 2018, 08:16 | #7 |
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Just a thought. Could it be the timing is set correctly but the locking tool is not the right one?
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19th August 2018, 08:32 | #8 |
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Are you 100% sure you have the 190 tools as most kits dont actually have them although they say 190 on the packaging, the Laser kit is one that springs to mind as being wrong.
Yes your engine type FP58 is the correct one for the model year and the heads will also have 190 written on them (behind the pulley covers). |
19th August 2018, 08:44 | #9 | |||
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Quote:
Out of curiosity I did that too and, like you, the result was not what I expected! Since my engine had always run faultlessly I abandoned the idea and carried on with the belt replacement. When you fit your new front belt using the 190 tools your camshafts will be timed correctly and that’s all you need be concerned about. Quote:
Quote:
Matt; can I take this opportunity to mention a couple of important things I learnt when doing mine? Pay particular attention to the tensioner and idler pulleys and replace them if running roughly. On reassembly, it is vital that you set the position of the tensioner pulley according to INA’s service information (the OEM manufacturers of this pulley). This is not mentioned in RAVE or Haynes. Feel free to PM me if you have any questions and I’ll be glad to help. Simon
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19th August 2018, 09:24 | #10 |
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MG ZT 190+ (Development car), mg zt 190SE (Twilight), MG ZS 180 Join Date: Nov 2017
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Firstly, Thank you all for the really positive and most useful info.
To confirm my locking kit is the sealey set and yes I have the standard 2.5v6 locking plates and the additional mg190 plates too. As the rear cambelt pulleys did not align (by about 2 belt teeth) I decided to check the alignments before slackening the belt. Basically in the safe position the 180 locking plates fits perfectly and the 190 ones did not suggesting it had been timed in that manner. Thanks for the engine number info and also heads stamping info, I’ll check that tonight if time after work. I’ll keep you updated in case this occurs to anyone else, in the future. But basically the plan is too. 1.)Mark up the belt and pulleys in the current timing config, so if I am wrong or make a mistake I have a reference point to go back too. 2.) slacken the belt main belt and align the camshaft with the 190 plates and then I am hoping the rear belts will re align those couple of degrees and restore faith. If not back to the drawing board. I have heard it is easier to replace the rear belts first using relative belt position rather than notches and re tensioning off the main cambelt exhaust camshaft. Also thanks for the info about the belt tensioning pulley. I’ll cross check that too when 5 time comes. Last question am I right in think, that with this engine if miss timed in the wrong timing position (either 180 or 190) there is no chance of damaging the engine I.e the valves hitting the pistons? Regards Matt |
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