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Bringing a 740 back to life

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Old Jul 29th, 2021, 21:02   #151
Challo
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Originally Posted by kiloran View Post
Start her up, get her up to temperature and give that hose a squeeze (with gloves on). As Dave says, hopefully just a perished or not tight enough hose but that's where my HG blew. Didn't overheat but squeezing that hose caused coolant to spray out of gasket between the head and the block. I'm sure it's not that, but that's how my blown HG revealed itself...
Thanks. What’s interesting is that I took the car out yesterday, and noticed a damp patch when I went out tonight. When I topped up the coolant bottle with water it created another loads of drips to come out.

No idea if that means anything, but the car was cold as I didn’t attempt to start it. I’ll check the pipes for leaks. Don’t fancy having to drain the system again as getting rid of old coolant is a nightmare
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Old Jul 29th, 2021, 22:00   #152
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So had a quick look underneath and managed to take some photos. You can see the coolant in the light and seems to be underneath the water pump.

I did squeeze the pipe and that doesn’t look to be leaking. Water pump gasket?
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Old Jul 29th, 2021, 22:15   #153
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So had a quick look underneath and managed to take some photos. You can see the coolant in the light and seems to be underneath the water pump.

I did squeeze the pipe and that doesn’t look to be leaking. Water pump gasket?
Looks very like the hose to me Chris :



Unless i'm mistaken, the end is delaminating and leaking, also on the other pic there is a clean patch on the underside of the water pump stub where the hose meets it which is probably the source of your leak.

If you can see what i mean and perhaps confirm it in "real life", i would suggest renewing that hose. If you're very quick and have new clips on a new hose, you should be able to loosen the clips on this one, loosen the hose at both ends then whipe it off and the new one back on without losing too much coolant. If you have a bowl/bucket below, that will cath most of it and you can then just add it back in, topping up if needed.
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Old Jul 30th, 2021, 10:00   #154
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Dave’s diagnosis appears to be the first port of call BUT.
I cannot see it in your images but there may be what I term a “weep hole” on the underside of the water pump body under the internal shaft. I cannot remember now but it may be partly obscured by the pulley. My water pump started to leak from that hole due to some internal seals failing. It gradually increased until I replaced the water pump.
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Old Jul 30th, 2021, 10:20   #155
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Dave’s diagnosis appears to be the first port of call BUT.
I cannot see it in your images but there may be what I term a “weep hole” on the underside of the water pump body under the internal shaft. I cannot remember now but it may be partly obscured by the pulley. My water pump started to leak from that hole due to some internal seals failing. It gradually increased until I replaced the water pump.
That's a very good point Ian but one of the things that led me to my conclusion is in one of the pics, you can actually "follow" a "clean path" from the visible drip to the point where i believe the hose is leaking.

That said i could still be wrong as although those photos are good, there is still the age-old thing that they may not have captured exactly how it is because of photo angle, refraction/reflection of light and so on.

The other option would be a bucket/bowl underneath, loosen the Jubilee clip and pull the hose off the water pump stub and inspect. If memory serves, there's enough length on that hose to cut 3/4" (20mm) off the end and refit after giving the stub a clean with Scotchbrite or similar to remove any limescale. Once refitted return the contents of the bucket/bowl (preferably through a filter so as to not introduce any dirt that may have been washed off the underside of the pump etc) to the expansion tank, run up to temperature and check.

PS...... Purely for technical interest, on my other beast the "tell-tale hole" as it is termed on that car is hidden but any leaks from it present as a leak of coolant from the crankshaft pulley. This means urgent renewal of the timing belt and water pump as it signifies the water pump will let go imminently which will throw the timing belt too. The timing belt interval is 96k on that and the water pump is a service item at 120k, the wise owner replaces both at 96k.

The shortest time/distance i've heard of from the leak being noticed to throwing the timing belt was 7 miles - i think the owner just hadn't noticed as it's usually a bit more but he was lucky and no valve-piston contact occurred.
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Old Jul 30th, 2021, 14:19   #156
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Right gents…grabbed a photo of the hose and it’s not the best. Obviously been over tightened previously, but as mentioned never leaked before.

I’ll get the quick repair done tomorrow and trim the hose accordingly and refit. I’ll also give that areas a degrease as well to make things clearer to spot leaks.

Hopefully that should pin point if it’s the hose or the water pump or something else.
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Old Jul 30th, 2021, 14:46   #157
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Right gents…grabbed a photo of the hose and it’s not the best. Obviously been over tightened previously, but as mentioned never leaked before.

I’ll get the quick repair done tomorrow and trim the hose accordingly and refit. I’ll also give that areas a degrease as well to make things clearer to spot leaks.

Hopefully that should pin point if it’s the hose or the water pump or something else.
What you could do Chris if you have a really sharp Stanley knife is to use the Jubilee clipe as a guide, cut round the hose (against the edge of the clip) on the good side, remove the Jubilee clip (in practice just loosen it and slide it up onto the good part of the hose) then slice in the direction of the hose towards the end/water pump.
Remove the piece of hose you've just cut off the end of the hose, push the good hose further on to the stub and tighten the Jubilee clip.

It looks like there's enough good hose on the water pump stub that it won't come off so you can cut the bad end off easily this way without removing the hose to do it but would pay to have a bucket/bowl just in case.

I can do a couple of drawings if it helps to explain.......



Just one drawing, should help explain what i mean.
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Old Jul 30th, 2021, 14:51   #158
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Originally Posted by Laird Scooby View Post
What you could do Chris if you have a really sharp Stanley knife is to use the Jubilee clipe as a guide, cut round the hose (against the edge of the clip) on the good side, remove the Jubilee clip (in practice just loosen it and slide it up onto the good part of the hose) then slice in the direction of the hose towards the end/water pump.
Remove the piece of hose you've just cut off the end of the hose, push the good hose further on to the stub and tighten the Jubilee clip.

It looks like there's enough good hose on the water pump stub that it won't come off so you can cut the bad end off easily this way without removing the hose to do it but would pay to have a bucket/bowl just in case.

I can do a couple of drawings if it helps to explain.......
Thanks Dave I understand. I will give it a go tomorrow if the rain holds and see how we go.
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Old Jul 31st, 2021, 15:01   #159
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Looks like it is the water pump. Did the fix on the pipe and removed a little bit from the end and refitted.

Started the car and you can see coolant dripping out from underneath the pump. I checked the hose and the end is dry so nothing coming from that. Looks like another fix I need to do before i can get it properly on the road.

Frustrating as everything looked good after the MOT. Back in the garage she goes.
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Old Jul 31st, 2021, 16:43   #160
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Looks like it is the water pump. Did the fix on the pipe and removed a little bit from the end and refitted.

Started the car and you can see coolant dripping out from underneath the pump. I checked the hose and the end is dry so nothing coming from that. Looks like another fix I need to do before i can get it properly on the road.

Frustrating as everything looked good after the MOT. Back in the garage she goes.
That's a nuisance Chris! Just to be sure, it's not coming from the seal between the pump and head is it?

If not and you're convinced it's the pump shaft seals (only other place it can leak except the gasket which would be obvious) then it's a new pump - go for an SKF one, they're a bit dearer than most but you don't want to have to do the job again in a few months!
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