75ZT CommunityA social community of enthusiasts, owners, appreciators and collectors. With expert knowledge of all things from MG to Rover and beyond.2016-04-12T20:46:32+00:00https://www.75ztcommunity.co.uk/feed.php?f=8&t=7976&mode2016-04-12T20:46:32+00:002016-04-12T20:46:32+00:00https://www.75ztcommunity.co.uk/viewtopic.php?t=7976&p=82183#p82183
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Trebor wrote: Steve thats a great how to and will no doubt come in useful to me one day, when is the second episode ?
Hi Rob. Funny I have just thought I will have a stint at the second part as it too is going to be long
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]]>2014-05-12T23:19:03+00:002014-04-11T01:12:08+00:00https://www.75ztcommunity.co.uk/viewtopic.php?t=7976&p=74846#p74846 With all the thermostat parts in front you straight piece, housing, and the bend start by fitting the straight piece into the housing.
Straight piece with Fig 106 106
The bend Fig 107 107
The housing with the straight piece fitted into it, this you need to do first before you offer and fir the housing and straight piece back into the engine Fig 108 108
Now you have the housing and straight piece together feed thin into the V of the engine you can and should smear the ends of the straight piece and the hosing with a lubricant Vaseline etc, make sure you push home the straight pipe and then push the thermostat housing down and in Fig 109 109
Double check the straight piece by looking through the manifold holes into the V with a touch as here Fig 110 110
And also at the housing end as here Fig 111 111
Next check the housing it's self is pushed home and seated right, this housing as lugs and only allows the housing to be pushed home as much as it should be Fig 112 112
The next step is to fit the bend again making sure the end is lubricated to help it being pushed home with ease Fig 113 113
Look through the holes in the manifold again with a torch and make sure you have lined up the adjoining holes in the housing and the bend then offer the bolt to it carefully through the hole in the manifold using the socket and ratchet you remove it with Fig 114 114
After fitting the bolt which holds the bend and housing in place double check the straight piece in still in place Fig 115 115
Now you are satisfied that the thermostat is fitted correct you can start adding the hose to the housing pipe work do the small middle one first Fig 116/117 116
117
Next fit the large one which fits on to the bend Fig 118/119 118
119
You can now fit the hose with the bleed screw in it to the main thermostat housing Fig 120 120
And fit the hose also to the bottom of the radiator Fig 121 121
With all hose fitted and jubilee clips tightened up make sure the bleed screw is hand tight as you will need to undo this at a later date when bleeding the system. Fig 122 122
Fit all the wiring and throttle body with breather pipes back into place Fig 123 123
Making sure you fit the throttle cable Fig 124 124
If you are working on your own as I was you need to find something to raise the header tank up as far as it will go to refill it slowly, as you can see here I used a short plank of wood Fig 125 125
I rested the locating pegs on to the rad housing as here Fig 126/127 126
127
I filled the header tank slowly at the same time I undid the bleed screw and carried on filling until the water came out of the bleed screw then I screwed in back in making sure the coolant never dropped below the minimum level when filling, thus trying my best to avoid an air lock Fig 128 128
Once happy i ran the engine with the header tank still raised and kept my eye on the coolant once I saw is rising I added the coolant cap and let the car get up to temperature 91 turned the engine off and let it cool a bit, at this time I again checked in the V to see all was ok and not leaking Fig 129 129
I then checked the level in the header tank all seemed ok ran the engine again this time up to 101 and waited for the n to kick in and bring the temp down to 95 I did this a few times and turned the engine off, I cleaned up all my tools and put them away, I went and ate my tea by the time I had finished an hour had passed and I again checked into the V for leaks etc it was bone dry Fig 130/131 130
131
Also checked at the housing connections Fig 132 132
The next morning I again checked the coolant in the header tank and it was spot on with the max mark Fig 133 133
]]>2014-04-18T01:43:46+00:002014-04-10T23:50:32+00:00https://www.75ztcommunity.co.uk/viewtopic.php?t=7976&p=74845#p74845 Below is how I removed and fitted the thermostat I hope this helps some other members if they have to do the same job, remover the under tray before starting the task,the thermostat I removed had only been fitted for 2 years with limited mileage of about 3.700miles.
First remove the engine cover two 8mm bolts Fig 1 1
Remove the cover and put it in a safe place with the bolts Fig 2 2
Using a torch and shinning it through the gap in the manifold I can see the leak Fig 3 3
The next step is to remove the air filter box from the engine bay, loosen the hose clip on the throttle body inlet hose Fig 4 4
Pull off the small air induct hose pipe Fig 5/6 5
6
Next you can pull up the air box it may be stiff as it sits in the holes and is held in by the lugs under the box Fig 7/8 7
8
You now need to release the Shannon tube from the air box Fig 9/10 9
10
Air box removed put it safe with the engine cover in the boot of the car Fig 11 11
You may see a little oil in the air induct hose this is normal and can be cleaned out before re-fitting Fig 12 12
There may also be a little oil in the throttle body again do not worry Fig 13 13
You can now see the three hoses that are connected to the thermostat and the bleed screw Fig 14 14
Later you will also need to remove the bottom hose that is the reason for removing the under tray before starting the task. Fig 15 15
The next parts to remove are the breather hoses, the first one is the one connected to the vis motor & throttle body and the front Fig 16/17/18/19 16
17
18
19
These hoses are removed by depressing the red locking collars Fig 20/21 20
21
You will have to use a screw driver to depress the locking collar connected to the vis motor Fig 22/23 22
23
The last locking collar on the top breather pipe is connected to the top of the throttle body and is black an again a screwdriver may be used Fig 24/25 24
25
You can now pull back the engine bracket and feed the hose past it Fig 26/27 26
27
With the hose removed again put it in the boot for safety Fig 28 28
You can now remove the second breather hose Fig 29 29
Start at the front cylinder head again depress the collar Fig 30/31 30
31
Them move to the collar on the manifold Fig 32/33 32
33
The last part of this hose to be removed is the T piece, this is held in by a white collar Fig 34 34
This white collar needs to be pressed in at both ends and twisted to release the hose Fig 35 35
Once remove inspect it and make sure it is in good order no cracks or splits and put it in the boot Fig 36 36
Next step disconnect the vacuum hose from the idle control valve Fig 37 37
Place this hose to one side for now Fig 38 38
You can now unplug wiring plug from the throttle body Fig 39/40 39
40
unclip the next plug underneath by depressing the metal spring clip Fig 41/42/43 41
42
43
With the two wiring plugs removed set them out of the way Fig 44 44
Next we turn our attention to the throttle cable Fig 45 45
lift the throttle lever and remove the cable 46/47 46
47
We now need to remove the throttle body it's self which is secured to the manifold by four torx 30mm bolts two above and two below Fig 48/49/50 48
49
50
You will need to use a long reach socket and ratchet with 30mm torx start with left top bolt Fig 51 51
Next bottom left Fig 52 52
Bottom right Fig 53 53
Last top right Fig 54 54
Once removed inspect and clean up with a bit of WD 40 and in the boot with it Fig 55 55
You can now put a container under the bottom radiator hose and remove it to let out the coolant Fig 56/57 56
57
This hose with the bleed screw in it will be removed once the coolant as be drained off Fig 58 58
I then tied back the breather hose so it would not be in my way later Fig 59 59
The next step is to remove part of the thin header tank hose again for more access later Fig 60 60
To help get to the hose above better remove the lead of spark plug 61 61
With the lead removed you can use some grips to open the hose clip and set it back Fig 62 62
You can now pull out the T junction as here fig 63 63
We now need to remove the right hand side of the header tank hose from the T joint Fig 64 64
As before release the hose clip with some long nose grips or mole grips and remove the hose Fig 65 65
The hose can now be moved to the front of the engine out of the way Fig 66 66
The other part of the hose can be tied back with the breather pipe with the white collar from before Fig 67 67
Now that the thin header tank hose is out of the way you will see there is some wiring also that will need to be lifted later, but as you can see another breather hose is lying over the top of it this will also have to be removed Fig 68 68
To remove this last breather pipe again as before press the red collar and it will release Fig 69/70 69
70
Breather pipe pulled out Fig 71 71
Removed from the engine put it safe in the boot with the others Fig 72 72
Now with most of the item out of the way we can see the thermostat and the hoses connected to it Fig 73 73
You can now check the header tank it should be empty Fig 74 74
Also check at the bottom hose & rad to see if the coolant as stopped coming out Fig 75 75
We are now ready to remove the large hose with the bleed screw attached to it again use long nose grip if you have some if not mole grips will do or pliers Fig 76 76
Once removed from the car put it safe Fig 77 77
With the first hose removed we can then turn our attention to the other two Fig 78 78/79
79
Now release the clip from the next large hose and pull it backward Fig 80/81/82 80
81
82
This hose is connected to the top of the radiator Fig 83 83
With the clip released you can now pull off the hose expect a little more coolant to drain out Fig 84 84
You can now tie this hose out of the way Fig 85 85
Before you carry on mop or soak up the split coolant Fig86/87 86
87
We are now ready to remove the last hose from the middle the smaller of the hoses Fig 88/89 88
89
Now that the middle hose as been removed and tied back to the other one, we can turn our attention to removing the 10mm bolt which holds the thermostat in place to the engine block, you will need a thin long reach socket with a knuckle on the end to do this through alloy manifold Fig 90 90
Pass the socket through the gap in the manifold as here Fig 91 91
Once you have the socket through make sure it is seated on the bolts head properly Fig 92 92
Get a good grip and turn the ratchet socket slowly to break the joint on the bolts and it will them release quite easy Fig 93/94 93
94
Once you have the bolts to the end of its thread and still sitting in the elbow joint you will need a telescopic magnet to remove it if not you will be fishing for it later in the V of the engine Fig 95/96/97 95
96
97
You are now ready to prise out the thermostat housing first try twisting and lifting the elbow bend if no joy prise the housing up it's self as here Fig 98 98
You will now get some more coolant flow into the V of the engine this can be cleaned up later when al the hosing as been removed and before re-fitting the new housing.
If you are still finding it difficult to remove the housing use the long nosed grips to help as here Fig 99 99
remove if you are going to re-use the housing maybe because only the seals have give way then set to one side safe Fig 100 100
With the main thermostat housing body remove it will leave the straight piece and the elbow bend in place you can now remove these Fig 101/102 101
102
Those should remove easy now you can clean up inside the V of the engine Fig 103/104 103
104
I also hoovered some coolant out of the openings which the thermostat fits into so it did not over flow when replacing later.Fig 105 105