Injector seals question, 87 esprit - LotusTalk - The Lotus Cars Community
 
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post #1 of 10 (permalink) Old 01-11-2016, 01:22 PM Thread Starter
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Injector seals question, 87 esprit

Greetings!
I'm trying to change my injector seals, the old ones leaked and I bought a new set from jae.
The seals were hard to get on, but eventually did.
The problem I'm having is that the injectors don't fit or snap back in easily, or as easily as it should. It would almost seem as if the new seals are too big, however they appear to be the same size as the old ones.
Is there a particular technique to putting the injectors back on?
I heard dropping the seals in hot water for a few minutes will soften them up a little.
Anything else I should be doing or looking for while I'm there?
Thanks in advance,
Tomas

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87 esprit hci, red/black
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post #2 of 10 (permalink) Old 01-11-2016, 03:47 PM
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I just installed new CIS injector seals back in August, they were the black seals, and I had the exact issue, I put a light film of oil on them, and they popped in much easier. They were also difficult to get onto the injector as well. Even getting a couple of the existing ones out was difficult. I liked the black ones that are difficult to get in and out much more so than the green ones that I installed previously, the green ones I had seem to tear easily. They were a much softer rubber.
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post #3 of 10 (permalink) Old 01-11-2016, 03:47 PM
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Tomas,

Excuse this rather personal question,


What color are your big fat upper o-rings? Green? <BLUSH>

Reason I ask, is that when I refreshed my Esprit's engine, I got a set of injector seals with green upper o-rings from JAE. Some folks had managed to get them to fit, but @Type82 and I messed with my replacements until we tore some of the lower seals.

I then ordered another set, and this one came with black upper o-rings, and THESE WERE SMALLER. They fit correctly!

Attached is a picture....with measurements. See how they compare to yours.
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This picture shows how the original seals compressed.
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PS, Lotus always recommended a coating the seals with ATF to help them seat.

Atwell Haines
'88 Esprit
Succasunna, NJ USA


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post #4 of 10 (permalink) Old 01-11-2016, 06:21 PM
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I believe the black set I purchased were actually for a CIS 944, not an Esprit. They were exactly what came off the Lotus though im sure, or close enuf to do the trick.
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post #5 of 10 (permalink) Old 01-12-2016, 05:32 AM Thread Starter
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Thanks guys,
My new set are the black ones, and we tore two of them trying to get them in. 😩
The old ones were on so hard I had to cut them off.
Two notes: be careful with the smaller, thin seals, they rip easily; and also be careful with the big fat ones, there is a C-clip below it and you don't want to damage it.
We've ordered some new ones from a different source so let's see what happens.
Come on Betsy!

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post #6 of 10 (permalink) Old 01-12-2016, 05:55 AM
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Don't lose sleep over a cut (or slight compression) in the upper (fat) o ring. Its main purpose is to align/center the injector in the hole of the intake.

The lower (smaller) o rings are critical to the running of the engine. If they leak, that's intake air that has bypassed the metering unit.

When you first pull out the injectors, look for streaks, indicating air past the smaller o rings. That is what indicates a leak. Of course, if you remove the injectors you should ALWAYS replace the o rings...

Atwell Haines
'88 Esprit
Succasunna, NJ USA


"Not all angels have wings." - Turbo R
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post #7 of 10 (permalink) Old 01-13-2016, 04:27 AM
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I did not know about the injector sealing car buff. I thought the upper rings were the sealing ring. To determine that tonas87s car had intake leaks I pumped smoke into the intake. My 83 rabbit gti has a Bosch CIS and it only has the big fat oring at the top and does not have the lower seals at all. I oiled the orings I tried to put in and pressed as hard as I could with a wooden dowel and they would not go in. I finally hit the wooden dowel with a hammer....really hard...over and over again with toe of them. They both tore off pieces of the upper oring but did seat. It was cold outside as its winter here. Will try again tonight... Thanks for the help.
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post #8 of 10 (permalink) Old 01-13-2016, 07:00 AM
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If the upper o rings are not too big, they should pop in with only a 'reasonable' amount of persuasion.

I suggest measuring them first, look at the picture I posted in Post 3. If they are too big (over 16mm OD), I would buy a different set.

Atwell Haines
'88 Esprit
Succasunna, NJ USA


"Not all angels have wings." - Turbo R
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post #9 of 10 (permalink) Old 08-21-2019, 04:53 AM
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When installing new o rings does the top hat and the c clip need to be removed? Thanks.
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post #10 of 10 (permalink) Old 08-24-2019, 06:15 PM
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Sorted...Top hat comes off, C Clip stays in place.
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