Post by: PK on January 02, 2019, 01:17:45 pm
Cheers
PK
Post by: Fierofool on January 02, 2019, 03:22:13 pm
Post by: PK on January 02, 2019, 04:05:11 pm
I am going to check my enjun number vin .. think you said above starter? To make sure enjun is definitely '86 as it has engraved plenum.
There is one OEM on eBay... And it's the GM pinned version I think. Will see if damper doc gets back to me.
Post by: GTRS Fiero on January 02, 2019, 05:54:02 pm
Post by: Fierofool on January 02, 2019, 08:09:17 pm
Some thoughts on a pinned harmonic balancer. There is a rubber cushion between the outer ring and the center hub. That rubber cushion is there to take up shock. If the outer ring is pinned to the center hub, there is nothing to absorb shock. If the shock absorber isn't needed, why didn't they just make a solid harmonic balancer? I'm no automotive engineer, but that's my logic on the subject.
Post by: PK on January 03, 2019, 12:24:32 am
I guess the lines pinned balancers still have the rubber damping capability but also has an anchor to stop rotation of outer on inner.
Nothing back from damper doc yet and not good if gtrs heard noubt! His online contact form was a bit weird, it didn't give any confirmation that the message had sent. Will give it a few days and then try to find an email address.
Thanks for the advice.
Post by: PK on January 03, 2019, 03:35:25 am
A friend has a very rare car and made his own silicone vibes using the old metal shell. This process may work on the old harmonic balancer but positioning would obviously be critical.
Post by: PK on January 03, 2019, 08:34:35 am
Haynes tells me where the engine number is but no information on coding. Can anyone advise please?
Post by: PK on January 03, 2019, 08:38:00 am
I rotated the enjun whilst feeling the inside edge of the balancer.... It does not have the metal rectangular "weight" cast into the harmonic balancer spoke by the keyway.
Post by: Fierofool on January 03, 2019, 11:12:58 am
Post by: PK on January 03, 2019, 01:09:45 pm
Anyways if I can't work out the year from that code by the starter I'm not going to worry about it.
The damper doctor did get back to me after I dug up an email address rather than online form.... The reply had 5.5 words that seem to be in no particular order but I have replied and will hopefully get a response!
Post by: TopNotch on January 03, 2019, 01:48:52 pm
BTW, you can get a balancer here (https://www.damperdoctor.com/).
Post by: PK on January 03, 2019, 01:58:42 pm
Damper doctor are the people I'm trying to contact.
Post by: Fierofool on January 03, 2019, 03:18:29 pm
.. Which would make the article incorrect and mean that some 86 enjuns were internally balanced and some externally!!
Damper doctor are the people I'm trying to contact.
Incorrect. Only 88 engines were internally balanced. 85-87 V6 engines were externally balanced on the flywheel.
Post by: PK on January 03, 2019, 03:59:24 pm
In the linked thread, Damper doctor said:
INTERNALLY BALANCED DOES NOT HAVE A LUMP OF WEIGHT ON THE BACK OF THE BALANCER
EXTERNALLY BALANCED HAS A LUMP OF WEIGHT ON ONE OF THE FOUR PRONGS. IN THE BACK OF BALANCER.
BOTH ARE SAME PRICE."
In the same thread 86 owners reported Harmonic balancers with and without the "weight".
Rodney was thinking of producing these at some point and I can see why he didn't with all the conflicting information.
Post by: Fierofool on January 03, 2019, 04:18:07 pm
Post by: Fierofool on January 03, 2019, 04:23:58 pm
https://www.hagerty.com/articles-videos/articles/2017/11/27/identify-pontiac-engine-blocks
Post by: TopNotch on January 03, 2019, 04:35:02 pm
See especially the second paragraph of the second column.
Post by: PK on January 03, 2019, 04:45:23 pm
Thanks FF, I will enjoy reading that linky dink.
Post by: PK on January 05, 2019, 06:29:34 am
If you can't see the VIN on the block, assuming they used the flywheel that might have been on an engine swap, and your inspection plate is off at the bottom of the bellhousing, you can pull the coil wire and slowly rotate the engine and look for counterweights on the flywheel. An 88 engine and flywheel won't have counterweights.
Checked just now, I have an externally balanced enjun.
My terrible memory told me the inspection plate would come the whole way off without removing anything but couldn't work out how!??
I also have a small oil leak either from the sump or real seal... Deep joy. :0)
Post by: PK on January 05, 2019, 06:30:25 am
If you can't see the VIN on the block, assuming they used the flywheel that might have been on an engine swap, and your inspection plate is off at the bottom of the bellhousing, you can pull the coil wire and slowly rotate the engine and look for counterweights on the flywheel. An 88 engine and flywheel won't have counterweights.
Checked just now, I have an externally balanced enjun.
My terrible memory told me the inspection plate would come the whole way off without removing anything but couldn't work out how!??
I also have a small oil leak either from the sump or rear seal... Deep joy. :0)
Post by: GTRS Fiero on January 05, 2019, 08:31:38 am
Post by: PK on January 05, 2019, 08:39:37 am
Post by: GTRS Fiero on January 05, 2019, 08:42:23 am
Post by: Fierofool on January 05, 2019, 09:26:15 am
Unless some late '86 models got the later plenum.
That's possible. Look at the manufacture date on the door decal. If it was something like late June of 86, that may have happened. It might even be an 87 engine, which I believe has some improvement on the oiling galleys.
Post by: PK on January 06, 2019, 07:08:07 am
Post by: GTRS Fiero on January 06, 2019, 08:57:41 am
I'm also curious if you have the pre-'88 oil sending unit.
Post by: PK on January 06, 2019, 10:15:39 am
Post by: PK on January 10, 2019, 12:21:32 pm
Post by: GTRS Fiero on January 10, 2019, 06:11:05 pm
Post by: PK on January 15, 2019, 07:10:24 am
Does the brake booster port have a threaded bushing that screws into the plenum?
No.
Post by: GTRS Fiero on January 15, 2019, 07:20:56 am
Post by: PK on January 15, 2019, 08:48:07 am
I took of the brake booster pipe from plenum to take a pic, then thought it would be neat to get the engraved plenum in the shot. As the camera focused I realised my plenum isn't engraved .... My mind has somehow imprinted it as engraved. Ooooops.
Post by: GTRS Fiero on January 15, 2019, 06:07:18 pm
Post by: PK on January 16, 2019, 02:06:15 am