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| 1275 Valve train rattle? - Update with pics https://www.ausmini.com/forums/viewtopic.php?f=2&t=85235 |
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| Author: | goblikon [ Fri Apr 11, 2014 3:57 pm ] |
| Post subject: | 1275 Valve train rattle? - Update with pics |
Hi guys i will set up a build thread in the Members area soon but i have a slight issue/maybe a big one my 1275 gt has rattled ever since i got it last week so... Today I set my Tappet Clearances (0.012") on my 1275 and it still rattles like a MoFo. What causes this? ( whats gone bung I'm a competent DIY mechanic just been a few years since i worked with an A series) any speculation would be appreciated cheers Andy |
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| Author: | MiniVLT [ Fri Apr 11, 2014 4:40 pm ] |
| Post subject: | Re: 1275 Valve train rattle? |
Are you sure it's the valve train? I take it the rattle is coming from the top of the engine? What about something like the radiator shroud not tight, or even a stretched timing chain? Have you tried the old long screwdriver and used it as a stethoscope to locate it? Cheers Shane |
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| Author: | Mick [ Fri Apr 11, 2014 4:43 pm ] |
| Post subject: | Re: 1275 Valve train rattle? |
A worn rocker shaft or rockers will allow movement. |
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| Author: | goblikon [ Fri Apr 11, 2014 5:19 pm ] |
| Post subject: | Re: 1275 Valve train rattle? |
Its coming from the top of the engine and as you rev up the rattle/tick speeds up with it! rockers have a bluey tinge to them this is good guys! anything else i should be inspecting? |
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| Author: | tasti [ Fri Apr 11, 2014 5:41 pm ] |
| Post subject: | Re: 1275 Valve train rattle? |
Did adjusting the tappets alter the noise at all? If there was no change your problem is probably elsewhere. |
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| Author: | goblikon [ Fri Apr 11, 2014 6:02 pm ] |
| Post subject: | Re: 1275 Valve train rattle? |
they rattled to start with so my first thoughts were to adjust = they were well out but it still rattles like it did before adjustment! kinda stumped is it the lifters/followers? |
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| Author: | gtogreen1969 [ Fri Apr 11, 2014 6:14 pm ] |
| Post subject: | Re: 1275 Valve train rattle? |
If your game - then take off the rocker cover and start the car. With it at idle you should be able to track the noise easier and even hold your finger down on top of each rocker in turn to feel and hear any difference. You might get lucky. Works a treat with hydraulic lifters on fords. |
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| Author: | goblikon [ Fri Apr 11, 2014 6:16 pm ] |
| Post subject: | Re: 1275 Valve train rattle? |
Thats a good idea will try that on sunday when i can get near the car again |
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| Author: | drmini in aust [ Fri Apr 11, 2014 6:48 pm ] |
| Post subject: | Re: 1275 Valve train rattle? |
The sintered rockers used on most 1275s are unbushed and can wear bad, my ex-boss had one wear so thin on the bottom that the rocker broke in half and was lying on the head. At least that one stopped rattling... |
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| Author: | goblikon [ Fri Apr 11, 2014 7:03 pm ] |
| Post subject: | Re: 1275 Valve train rattle? |
thanks for the comments guys i'll update in 2 days after further diagnosis its probaly is the rockers |
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| Author: | TheMiniMan [ Sat Apr 12, 2014 7:48 am ] |
| Post subject: | Re: 1275 Valve train rattle? |
If the rocker shaft has been out or replaced then i would be checking the oil-feed-hole hasn`t been blocked (in the pillars) the new shafts have the hole on the 2nd pillar, but the oil-feed-hole in the head aligns with the first pillar so , maybe you have the later sintered type rockers too, which wear quite horribly, but if there`s no oil getting to them then you will have some nastey stuff to fix So, the question is--> how wet are your rockers? |
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| Author: | goblikon [ Sat Apr 12, 2014 10:13 am ] |
| Post subject: | Re: 1275 Valve train rattle? |
they appear to be wet |
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| Author: | goblikon [ Sun Apr 13, 2014 10:00 am ] |
| Post subject: | Re: 1275 Valve train rattle? |
here what the rockers look like   head is a 12G940 , Ive also warmed the engine the taken the cover off then as its idling put a finger on each rocker 1 by one to see if that makes a difference in sound = nope! engine has been rebuilt at some point Estimated 30,000ks ago any other ideas lads? |
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| Author: | MG Rocket [ Sun Apr 13, 2014 10:39 am ] |
| Post subject: | Re: 1275 Valve train rattle? - Update with pics |
For my own education...Should the rockers be centered over the valve stems? |
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| Author: | Goldbrocade_62 [ Sun Apr 13, 2014 11:25 am ] |
| Post subject: | Re: 1275 Valve train rattle? - Update with pics |
Might be the pic but some off the rockers look close to the washers |
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