jack shaft adaptor

[Baggy2]

Hi,
Following another thread I was browsing the engine manual at http://www.duartevelezgrilo.eu/lotusela ... Engine.PDF . I noticed on page 35 fig 26 'Jack shaft Components' it shows an adaptor between the shaft and the sprocket. My engine doesnt have this. Last night I put the rebuilt head on including timing chains etc and did notice that the chain runs quite close to thr front of the main block but its always been like this and the crank, jackshaft and cam sprockets all seem to line up ok. Am I missing an adaptor or is this another lotus might be there, might not item? Please tell me I dont need it - I was up till 3.30 this morning building the engine and I really dont want to take it apart again!
Thanks all
Baggy

[types26/36]

Are you sure it is not there as it is quite a close fitting and not something you notice stright away, I think the chain would be way out of line with out it (1/4") and that would look compleatly wrong without it.

[Dag-Henning]

Don't think you would be able to fit the jackshaft sprocket if the spacer was missing.....! Look closer....

Dag

[CBUEB1771]

My engine doesnt have this.

The spacer (026 E 0017) between the jackshaft and the jackshaft sprocket is absolutely necessary. It moves the sprocket forward to clear the back plate of the timing chest. The spacer is not in English Ford pushrod engines because in those engines the timing chain cover bolts straight to the cylinder block with only a gasket intervening, no back plate. When you put the cylinder head on did you have the timing chest back plate in place? If so the sprocket would surely foul the back plate if the spacer was absent.

[garyeanderson]

I got the micrometer out and its 1/4 inch as Brian states, if you didn't know it looks to be part of the jackshaft. here are some photos of the assembly (It's nice to have stuff apart for years on the bench to get this kind of info and get it to others).


All of the parts back


All of the parts front


Half on sideview


Half on angle


Mostly home


front of jackshaft spacer


back of jackshaft spacer


.250 inch button

[GrUmPyBoDgEr]

Trust Gary to come up with the right Photos for the solution .
"A Picture saves a thousand Words"
Errrm, I'd forgotten how crude looking some Twincam bits look.
Interesting to see a Swedish "Imperial" Micrometer being used.
I'd have expected an American "Starrett"

John

[CBUEB1771]

Errrm, I'd forgotten how crude looking some Twincam bits look.
I'd have expected an American "Starrett"

1. Errrrm, damnation from a Zetec heretic.
2. Mostly Mitutoyo in the US these days.
3. Any chance you might pop over to the states for Lotus Owners Gathering 30 in October? We are trying to get a reasonable number of Elite people together and we'll buy your drinks (to a socially responsible degree of course).

[Baggy2]

Well I'm Stunned! This forum really is terrific. Thank you for your advice and the time and trouble taken sending the pictures. Although I cant see into the timing chest the adaptor must be there as I've double checked the alignment of the crank and jackshaft sprockets and it's spot on. Thanks again all
Baggy

[summerinmaine]

I got the micrometer out and its 1/4 inch as Brian states, if you didn't know it looks to be part of the jackshaft. here are some photos of the assembly (It's nice to have stuff apart for years on the bench to get this kind of info and get it to others).

Gary,

I've just gotta say that I've always admired the wealth of information and graphic detail you bring in your answers.

You are truly an invaluable resource to this board, and the entire Elan community.

Thank you.

Jim

[garyeanderson]

Having information and not sharing is nearly a crime in my eyes. I have known some smart people and they wouldn?t give up info if you broke every finger on both hands. This mentality I just never understood. When I worked at Digital Equipment, if you knew something you were saddled with that forever, or until you could teach someone else what you knew or how to fix what ever was broke. My ex boss has the same attitude as me and will teach you anything he knows. I guess that why I won't work for other folks now, I dislike tree huggers. If I don?t know something, I won't post or say. I don't like being wrong and guessing answers leaves me empty. Most of what I know is where to look or how to find answers, its kind of a challenge most times. I?m somewhat dyslexic and DJ's comment on the ?1000 words saved? is so true it hurts. Alex Black did a great job on his restoration and narrative, but I got lost on the 5th or 6th post, as the words didn't say what a photo and 10 words could. The other day Kevin asked what the water pump bolt lengths and sizes were. I could have looked it up and verified what I though it was from back in 1977 by looking in the manual. Back then I got some 2 ? inch bolts that were too long and the bottomed out in the blind hole, even in the U.S. 2 ? inch bolts were not a standard item. I had to get them from Don Tingle I think. Anyway it seems that some folks have paid attention and have downloaded the manual, some will keep asking questions that are answered elsewhere and I?ll keep pointing to where it can be found. Other stuff like this topic hasn?t been covered on this forum that I can remember so I put up the photos, when it gets asked again I?ll post a link. The next time someone else will have to post the link because now I an ?being boring?. Folks with the cute titles like ?what?s this? loose because I don?t read all of the stuff here.
Many posts that I have read have made me go and look at something, when looking I see something that I never noticed before so I learned something, then I can post what it is that I learned and we are all more knowledgeable about it.
My attitude has always sucked and won?t be getting any better as I get older, that?s life I guess. Some folks appreciate me for what I offer and others don?t, both are fine by me.

[rgh0]

2. Mostly Mitutoyo in the US these days.

I have used Mitutoyo for almost 40 years for all my measurement instruments. Would never use anything else.

cheers
Rohan

[GrUmPyBoDgEr]

Well the question has undoubtedly been answered & qualified with Photographic evidence; so I'm not embarrassed to drift off Topic.

Russ you said: "Errrrm, damnation from a Zetec heretic".
Got it in one; love it
You have to admire the quality of machining on modern Engines, G/Boxes etc.
Modern Machines & Cutters are highly capable, producing components at just a fraction of the costs that were involved 40 years ago.
A wonder of evolution!

Yes I have about 3 "Murphy's Verynear" Calipers; an oldie with engraved Scale mainly used in Photos of parts to provide a visual guide to the size of the Part.
The "Murphy"Digital ones have been bought cheaply from Supermarkets or Tool Shows.
1 for the office, wherever that was at the time GB or D
1 for Home, wherever that was " " " " "
1 for the Garage etc., etc.
(The "Job" had me moving around a bit in the past)
Why "Murphy"?
Well, am I the only one who is plagued by the flat Battery syndrome when I need to do some measuring?
The digital readout is great for tired Eyes & I've also invested in 0-1" & 1-2" Digital Micrometers for that reason along with the advantage of being able to switch from Metric to Imperial.

Much as I'd like to join you Guys at the LOG 30, I have plans to drive to the "Homeland" & have a sniff around different areas with the plan to settle down back there to enjoy the Historic Car scene & do a bit of Sea Fishing.
I might even buy an Elite if there's any Cash left over

Cheers
John

[Elan45]

Gary,

Your photos are really worth 1000 words. In all my 35 years with Elans, I don't think I have ever noticed a spacer. They must be all stuck to the jackshafts. Got lots of pushrod cams I've saved to be donor jackshafts some day, but all my TC rebuilds have always just re-used the old jackshaft. No tricks here like reversing the water pump pulley on a BDA to make it line up to the other pulleys eh.

I'd buy you a beer at LOG if I were attending, but as of today, I don't think it is likely. Awful pricey compared to LOGs of the past. Wish we were coming to LimeRock, but now they don't allow dogs anymore, I have one more reason not to tow that far. Lizzie loved that vacation and all the people who stopped to pet her in the paddock.

Roger

[garyeanderson]

Hi Roger

The beer is for some others, I drank all of my allotment before I turned 30. I did have some hard cider last fall and remembered why I don?t drink now. Too many smiles and not and sense. I may be at the LOG just for the field day, depends on if the sale of the Bugeye goes though or not. I hate to sell it but it just doesn?t really fit with all of the other Lotus I have.. It?s in the way and the Cortina?s are the next to be reckoned with. I need to focus on Elan?s end Elite?s if I am ever to get another car done. After that I?ll part out the ones that are hopeless, no one will pay what they are worth in parts and I need to get things down to a manageable level. Limerock will be another day trip this year, I like to see the folks and cars, I am not really hardcore about it, just have been going for quite some time and it?s the only time that I get to see some old friends.