Screech noise - fan or belt?

Thanks.

Earlier on I took another look, gave it some revs while parked up and the noise seemed to disappear. Shortly afterwards I took her out and after 100 yards a clanking sound followed by coolant everywhere. So initial problem “resolved” as the radiator now has a hole in it.

Looking again, I feel lucky to be alive. The rad fan had detached itself and the bolt penetrated the rad. Fortunately this did not happen when I was bending over the engine bay. And I was only doing low revs when cold so the fan was only turning slowly. Could have been more spectacular when hot and at speed, especially if my head had been in its way.

So new radiator time (not a bad thing anyway). Puzzled as to how the fan detached itself.

Anything else I should do while changing the rad?

Thanks

Nick

From the sound the clutch made it is logical that it disintegrated. Or it seized and then something disintegrated as the consequence. You had that coming.
Change the hoses while in there if they are not relatively new still, and see if the water pump got damaged or the fan got warped… i‘m happy for you as it could have hit the bonnet or yes, much worse.

You would think that failure rate would be lowest when a part/assembly is new, then increase monotonically with time as the part/assembly gets old. But failure rate curves are higher when the part is new, then decrease with time, then reverse and increase with time. This is due to defects in new parts or in their installation. They have to be “sorted out.” IMHO.

Nick,

may I join you in bad luck?

Back in 1992 I changed the viscous fan clutch unit in my Spitfire. Don’t know exactly when, maybe like 2010 I had an occasional screeching sound which always went away immediately. After the last ride before hibernation I parked the car and went for a coffee. When I returned to the garage it looked like in a Quentin Tarantino movie … at the time I used red anti freeze.

It turned out that over time several of the four mounting bolts of the fan had worked loose, lost their respective nuts and then worked their way forward. Before letting go the fan they would cut a nice circle into the radiator, pretty much like the axle spikes in Ben Hur …

I never understood why bolts that had lasted for years and years out of nowhere decided to come loose in the first place. I did understand though why original installation has you put in the bolts from behind and put the nuts on from the front …

Good luck

Jochen

75 XJ6L 4.2 auto (UK spec)

I would say its the belt.
Walter

Thanks all.
Challenge is now to source a replacement radiator fan. Assuming I stick to the mechanical set-up, I am having difficulty sourcing one. Nothing at Barratt’s or Anglo Parts. Any ideas?
Many thanks
Nick Hill
XJC 4.2 (1976, Canadian spec)
Paris, France

You could try…

https://www.scparts.co.uk/sc_en/british-cars/jaguar/jaguar-xj6-series-i-iii-and-daimler-sovereign-series-i-iii-1968-1987/cooling-system/fan-unit.html

Frankie

Is the fan bent? Ouch. I‘d try ebay, there is one for a 2.8 here in Germany, listed for €60 OBO - try 30 if it is the same as your 4.2 which you would have to verify. Maybe there are more available in France.
Fans themselves don’t age, unless they’re plastic in which case they will disintegrate and often mess up the bonnet in the process. I would not look for a new one if it is metal.
David

Aged metal fans will toss a blade. Aged plastic fans will toss a blade.

Time to consider electric fans. Many advantages. .Not limited to easier installation.

iI only the core of the radiator is damaged, it can be recored with a odern and more efficient part.

Circa 1950 or so, three kids did a last kid hurrah. A trip to California in Roy’s inherited 39 Ford. very nicely kept family car, but with a very tired engine. It ate oil!! Ran nicely, though!! No issue, my job at a full service station got me a case of Texaco 40 at cost. 24 quarts oughta get us there and back!!! Wrong, It got us there!! but, roy’s uncle was connected to Union 76. he contributed a case of 40 to get us back. We had a ball!!

Catastrophe, Not too far after Blythe Ca, the generator mounted fan tossed a blade!! Took a chunk of radiator as well, of course. It was night as the usual time to cross the desert in mid summer… ,We had tools and the skills to use them. Three teens pulled the radiator, removed the remnants of the fan. Pinched off the busted tubes. Put it back together,. added the water we carried. All by flash light Got to Desert center. of course, it had a radiator shop. An ideal place for one!!! .

Awaited opening in their park lot. We their first customer. We had pulled the radiator. No more money for a recore. So, the shop soldered the pinched tubes and closed off the weeps. . We put it together, added water. Hot day, but we drove anyway… No fan, but the engine stayed cool enough to make it. Roy installed a rebuilt engine, and new radiator and got it painted,
Off to California to start his job with Ford Aeronautics…

Carl

1 Like

Nice story, as usual. Since the blades are spot welded three times or so I think it would be very rusty, on the other hand a good tug will surely show up broken welds? Or are they impossible to find.
Whereas the plastic fans, they get so brittle they fall apart.

Great story, Carl! 24 quarts from Texas (?) to California - was that a Diesel engine;-)?

The steel fan on SII XJs is driven via a viscous coupling, so the physical load on the blades is very limited, while, as David indicated, the part is quite massive. I’d prefer it any time over the plastic SIII fan. While e-fans do have advantages I dislike their hairdryer sound, possibly coming in an on-off mode while you’re waiting at a red light. As long as the original is fine, I wouldn’t replace it. BTW, last Friday I took a trip under serious temperature (around 36°C ambient) and the water temp needle wouldn’t go over 12 o’clock. Without A/C in my car I had bigger problems with the heat than the engine …

Best wishes

Jochen

75 XJ6L 4.2 auto (UK spec)

Thanks all. The issue is that the metal fan is no longer manufactured. At the moment I seem to have three options:

(1) import a used fan from the US (the only one I have found so far)
(2) work-around solution of Mk 2 fan (https://www.scparts.co.uk/sc_en/fan-blade-1-23889.html) and viscous clutch; I am told that the fan can be readily adapted as it plastic and it can be re-drilled and this set-up is compatible with the XJ6 water fan;
(3) electric fan solution. But this may require an upgraded alternator …

Opinions welcome on the above (or indeed other options)!

Nick

75 XJC 4.2 auto (Canadian spec)

PS, I am using this car in the south of France where it needs to cope with 38C in a traffic jam…

Nick,

if your car is equipped with and you like to enjoy the A/C an upgrade is something to think about. There are uprated radiators available that look fairly original and the twin e-fan SIII setup behind is feasible, even though a lister just reported that things are not as simple as they might be.

Sticking with the original there is a metal fan here https://www.ebay.de/itm/Jaguar-XJ6-Kuhlerlufter-mit-Viscokupplung-XJ-6-4-2-Serie1-2-bis-7L8598/312719349118?_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D225078%26meid%3Da38f71839bab4818b6c596a3ee9249a0%26pid%3D100010%26rk%3D1%26rkt%3D12%26sd%3D174249333768%26itm%3D312719349118%26pmt%3D0%26noa%3D1%26pg%3D2047675%26algv%3DDefaultOrganic&_trksid=p2047675.c100010.m2109, but your engine might be younger, or here https://www.ebay.de/itm/Lufterrad-Lufterflugel-Kuhlerlufter-Jaguar-XJ-12-5-3-Serie-3-gebraucht/202914981980?fits=Model%3AXJ|Make%3AJaguar&hash=item2f3eace85c:g:XmAAAOSwzjxeIxNW. I’d take this one though https://www.ebay.de/itm/Jaguar-XJ-6-Serie-I-II-III-Daimler-2-3-4-2L-Visco-Viscosekupplung-Lufterrad/263953718788?hash=item3d74de1e04:g:6KUAAOSwSBhbp4xZ. Looks like good value for money.

Good luck

Jochen

75 XJ6L 4.2 auto (UK spec)

Do the various inline 6’s have the same fittings for the clutch and fan or is everyone different ?
And are the 6’s the same with the V12?
What are the differences between the metal, the white and the V12 yellow fans?

I can confirm that for the V12 :

  • The Hyden 2665 Standard clutch is a direct fit and keeps the engine temp bellow 90°C under all conditions.
  • The radiator fan from the Range Rover P38 and from the Land
    Rover first generation Discovery are bolt-on replacements for the yellow fan.

Actually, it has been bothering me. Was it a case of 12 or 24??? I am beginning to believe only 12!! And, we might have stretched the top off a bit further, not insisting on full at each check…

My 37 decided to bust a crank!! Right at the center main!! A friend did some of a rebuild for me. he screwed up!! Cotter pins on the nuts to the main studs. Wire is the right way!!!

I swapped in Roy’s engine. Actually a 46 Mercury. 239 CI the older one, only 221 CI. Smokey when pushed, but ran very well The tale of the Merc in Roy’s family car was another one…

The steel fans can flex and eventually at at the flex line. Jaguar folks have reported that… More forces at work there than we realize!!!

The trip was El Paso to long Beach…Round trip of course…

I do like the Efans in my lump!! PCM controlled…

Carl

1 Like

Aristides,

SI parts catalogue quotes fan C.28176 and clutch RTC 1002 for A/C cars and fan C.25641 and clutch C.28018 for non A/C cars. They look almost identical :frowning:

SII parts catalogue quotes the same fan and clutch combinations for non A/C cars until 7L.88914 and for A/C cars until 7L.85098.

From that point on they were superseded by fan C.39831 and clutch C.45015, but for both A/C and non A/C cars. Again, looking pretty much identical to the earlier combos.

Sorry, I don’t have any data on SIII and 12 cylinder cars.

It looks though as if all fans were pretty much the same in terms of size and blade design until the advent of the plastic fans in the SIII production run. Until then the difference is all about the mating surface for and the mounting of the clutch. Mix and match won’t work, I’m afraid, but if you get a decent set you should be alright.

Good luck

Jochen

75 XJ6L 4.2 auto (UK spec)

Thanks Jochen. Yes and unfortunately the two on Ebay you point to do not appear to be what I need (C39831 as you say). First is the prior model (I guess part no C25641 or C28176); second is for SIII V12 so I guess part EBC4553).

Mine takes the four bolt viscount clutch hence NBC2215AA rather than C45015.

Tricky business…

Nick

Nope, resolved!!! Why would I linger on asuch a minor point. Quarantine…

They were cases of 24!!!

Carl

You’re right, Carl,

one of the bigger problems about quarantine: it is very hard for us to “keep going” intellectually if left all alone. Keep the faith and as much connection with your family - and us! - as possible. Can you go out for a ride or to have a meal in a family restaurant or is everything closed down where you live?

Best wishes

Jochen

75 XJ6L 4.2 auto (UK spec)