Hi,
I have just purchased 2 new HE cylinder heads and Tappet block assemblies, plus a number of other new engine parts. In the box is a number of parts including some inlet valves made by AE (Federal Mogal). 8 in the box instead of 12, so I am looking to build up a set. The part numbers are V90304 and fit the valve seat and guide fine, but when I search on line for more I get conflicting info, some sites say the V90304 is for the H.E., but others say these are for the pre HE and I should use V90305? Can anyone confirm the V90304 is correct for the H.E. heads please?.
Thanks.

 

Clouder
The pre HE valves are a different size from the HEs. [See below, this seems not to be true] If the valves you have fit, they should be correct. BUT, I do not know if the 6 litre valves were of a different overall length or valve diameter size from the 5.3 engines.


My real question is, where did you get the tappet blocks from, please?
Greg

 

The LH Tappet block is still listed and available from Jaguar classic parts. The RH one from SNG Barrett. They were about 60 euros each.

 

Wrong way around. The RH one comes from Jaguarclassipart.com and is part number RTC3005 or JLM11897 and £53 pus taxes. The RH block is part number RTC3006 or JLM12001 and was purchased from SNG Barrett. This one is now listed as special order and is listed at £195!

 

The 6.0L valves are shorter than the 5.3L HE which is shorter than the pre-HE

When I bought new Intake valves the 6.0L are not available and the 5.3L ones are longer by about a mm.

Valve diameter are the same for ALL V12's pre-HE had a wider tolerance.

If the valves are not new I would check the stems for wear and roundness with a micrometer, every valve that came out of my 6.0L the stem was elliptical. So 24 new valves.

 

Thanks Warren, one of those things I have always thought, and always been wrong about!


Therefore, does it matter as far as Clouder's original question goes, as long as the overall length of the valves is the same as the old ones (ie the new ones are not the shorter 6 litre valves)?


Greg

 

Clouder
Further to the above, the Jaguar part number for PRE HE V12 inlet valves is EAC1549.
loads of places have them, (eg D Manners etc).
Manners list EAC3191 for the HE engine:
http://www.jagspares.co.uk/manners/P...imageField.y=0
Greg

 

Greg, Warren,
I have now tracked down the AE web catalogue for valve components and discovered that their listing for the Jaguar 5.3 HE engine from 82 to 90 is V903004 and the OEM Jaguar part number as EAC1549............... as you say, that is the pre HE part number, not the HE part number!

 

Jaguar being Jaguar, it is now up to Warren to tell us if there is any difference between the two!

 

As the valves are bucket and shim the stems are not hardened and can be ground shorter.

I bought 12 stainless intake valves which have a texture on the back of the head to promote homogenized mixture. Rob Beere has these.

 

Clouder
I have bought one from Jaguar, and have asked SNGB to get me the other one, but have heard nothing back from them yet.


The Jaguar one has arrived, but the bearing caps appear to be un-numbered. How do you know which goes where? The caps are taped to the block in a line at one end, and I wondered if they fit in the order they are taped in. Can you help by any chance?
Greg

 

Hi Greg,
No problem, I’ll take a look tomorrow for you, one came assembled, one not. If you don’t hear from me, give me a reminder on Monday night.
Andy.

 

Andy, a bit late in jogging your memory; but can you now throw any light on this matter please? I have a genuine Jaguar Tappet block, the caps are taped to it at one end, but no indication of whether the order they are taped in is the order they should be mounted in, or other means of identifying their correct position.
Greg

 

Greg are the caps numbered if they are then 1 goes at the front, if they are not numbered then the cam bearings are most likely not bored to size. You would need to check the ID with a inside micrometer NOT snap gauges.

 

There are no numbers, but the bearings have been bored. This is a ready to fit part.

 

Hi Greg,
Sorry I meant to get back to you before this.
Each individual bearing cap will have a numeral (from 1 to 7) lightly stamped on the side of each bearing block in 5mm high numerals. Block number 1 is positioned at the front of the engine assembly and 7 at the back of the engine. If you look down onto the top of the bearing block, into the recess where the part number is, the small rectangular block with the manufacturers logo on, is positioned toward the front of the engine.
I have this information from what I see from the installations I have and not from any written data from Jaguar, so if anyone wishes to counter this explanation, please go ahead.
Thanks, Andy.

 

Andy
Thanks for your quick reply. I went out into the barn immediately after I read this and looked again. After about 5 minutes examining one cap very carefully with a bright torch, at last I found the numbers; feint, I should have seen them before but for some reason I could not! Must get the cataracts done!
Thanks again, I really appreciate it
Greg

 

Greg, No problem. Glad it worked out.
Cheers
Andy

 

I can say in my case this is not correct. When my heads went for cleaning the shop mixed up all the bearing caps.

They are numbered 1 from the front of the cam to 7 rear. On the A bank all the numbers are on the exhaust side but the logos on the top are not all the same way around. Same on the B bank except for number 6 cap which has the number on the inlet side.

The ONLY way to determine which way around the cap goes is to install them and torque each cap and turn the cam by hand, if the cap is the wrong way around the cam can not be turned by hand.

 

warrjon; absolutly that has been standard practice from the early engine years 1910-2018.

at least i have done that all my life, i have a vid of my V12 turning the crank (by one hand) after torque down, before rear seal install , i have to know what i'm dealing with!