Changing Heads On 1987 LeSabre - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-24-2007, 03:53 PM   #1
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Default Changing Heads On 1987 LeSabre

I thought that I'd continue this conversation under a new topic, because there are over 40 posts in the original thread, which is located here:
http://www.bonnevilleclub.com/forum/...ic.php?t=86185

I'm going to remove the heads on the car; the model year and such is detailed in my signature, below my posts.

I know the cylinder locations:
Cylinder numbers (from the drivebelt end to the transaxle end, or passenger'* side to the driver'* side)
Front bank (or, radiator side): 1-3-5
Rear bank (or, firewall side): 2-4-6
Firing Order: 1-6-5-4-3-2

However...
The other end(*) of the wire(*)

Unlike the "distributor"- type, with one cap, and certain rotation direction (clockwise or counterclockwise), this one doesn't appear to be so easy to grasp.

Is there a guide or "key" available?
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Old 10-24-2007, 04:02 PM   #2
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We can get a guide for you... But if its still on the original Coil and you look really close, under the wire and near the coil pack screw, you should see a number for each cylinder next to the coil tower

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Old 10-24-2007, 07:27 PM   #3
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Default Type II

It'* a"Type II" coil/module assembly.
Three coils with the two towers on one side each.
Apparently, each cylinder is paired with its opposite cylinder:
(1-4, 5-2, 3-6)
Assuming this is correct, which one is which?
I marked everything before I removed them, earlier today.
But, how can I know that they were correct in the first place?
...other than "Did it run okay?"
By the way, the coil on the driver'* side is marked with a sticker that reads "03/12/87", but there are no etchings.
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Old 10-24-2007, 08:35 PM   #4
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Does this help?
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Old 10-24-2007, 10:06 PM   #5
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Thanks, Technical Ted.
Yeah, it does help.
Mine'* placed a little differently.

(Excuse the mess!)
I don't quite know how to translate yours to mine.
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Old 10-24-2007, 10:47 PM   #6
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The coil next to the ICM wiring harness is 1/4, middle coil is 5/2 & coil farthest from wiring harness is 3/6. The numbers are also molded into the ICM- see pic.

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Old 10-25-2007, 12:15 AM   #7
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And if it helps your routing any, you can 'mix' the two wires to each cylinder. Each coil fires twice. Waste-spark. So you can put 1 on 4 and 4 on 1, and it makes no difference.

With your odd placement, that may aid your routing somewhat if you need to.
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Old 10-25-2007, 01:08 AM   #8
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Default Thanks!

Thanks, Technical Ted and willwren.
That'* what I needed to know.
Now, about the exhaust manifold.
If I pull the bolts, will the heads come off without my having to fuss with the pipes any further?
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Old 10-25-2007, 09:17 AM   #9
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Yes, you can pull the bolts/studs and just lay them back (disconnect the crossover also). However, this won't make it any easier to clean the gasket surfaces. Once the cylinder heads are out of the car, I suggest removing the exhaust manifolds, cleaning them up, then putting them back. There are some restrictive internal welds that can be worked on.

Why are you pulling the cylinder heads in the first place?
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Old 10-25-2007, 11:31 AM   #10
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Default It jumped time.

It jumped time on Sunday, September 2nd, the day before Labor Day, and bent 3 valves.
I had the timing job done at a garage.
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