86 6.9, What To Be Aware Of ? - Ford Powerstroke Diesel Forum
Non-Powerstroke General Discussion General Discussion for 6.9L and 7.3L IDI (Non-Powerstroke) Engines

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post #1 of 13 Old 01-29-2007, 09:01 AM Thread Starter
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Question 86 6.9, What To Be Aware Of ?

Hi, new to the forum and I'd like some advise on an 86 F350 with a 6.9 that has been sitting for about 6 years.The seller will let me try and start it before making an offer.Are there some common issues with this engine? Any advise would be helpful. Thanks ,Matt

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post #2 of 13 Old 02-02-2007, 07:59 AM
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Quote:
Originally Posted by mazembe View Post
Hi, new to the forum and I'd like some advise on an 86 F350 with a 6.9 that has been sitting for about 6 years.The seller will let me try and start it before making an offer.Are there some common issues with this engine? Any advise would be helpful. Thanks ,Matt
They were known to have a weak bottom end. Some were fixed with recalls.
I know a guy that never took his in and the thing still runs like a champ.
-Dustin

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post #3 of 13 Old 02-02-2007, 10:45 AM
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Some 6.9's were great engines, and some were crap! I don't have enough info to tell what ones, but my Dad had an '83 that was good and my friend had an '85 that wasn't.

Derrick


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'97 F-350 "FORDOR" 4X4 (Dually Conversion, Shackle Reversal, Technicooler , Auto Meter Gauges, 4" DIY Dual Exhaust w/ '08 tips,
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post #4 of 13 Old 02-02-2007, 10:57 AM
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My Dad has an 83, 278,000 on it, 9' camper that's never been off it and it still runs like new. Nice truck, but like the others, I can't tell you what the problems were with them, sorry.

Gord.

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post #5 of 13 Old 02-13-2007, 10:28 PM Thread Starter
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86 6.9, What To Be Aware Of ?

I got it running , it sounds great and I bought it. Should be picking it up tomorrow.Thanks for the all the input.
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post #6 of 13 Old 02-14-2007, 12:12 AM
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Congrats on the truck man, lets see some pics, and let us know what your plans are for it.

Gord.

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99.5 F350, CC, LB, DRW.
7.3 AUTO 4.10s
AUTOMETER C2s EGT, TRANS, BOOST, OIL, FUEL PRES
ATS, WW, SSHPX, B ANNIH.
DP 6P 140EX.
AFE MAG F STG 2.
MAGNAFLOW 4'' TURBO BACK DUALS.
US GEAR SUPER D-CELERATOR
500LTR FUEL TANK
BILLET GRILL
ALARM & REM START/ ELC BAT DISC.
CB, SAT, GPS, PANASONIC CD, 5th WHL
35' GOLDEN FALCON

Been a mod longer than TJ hahaha
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post #7 of 13 Old 02-14-2007, 07:36 PM
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Make sure the coolant has the proper amount of additive in it. The IDIs were notorious for cavitation problems leading to pinholes in the cylinders.

'96 F250 4x4 Ext Cab, 5 speed. K&N FIPK - modified to use 6637; 3" downpipe, 6" stack; Beans modded IDM; Beans stage 2s; shimmed FPR; exhaust brake; 6 position TS; locked 4.10s
'93 F250 4x4 regular cab long box. 7.3IDI nonturbo/E4OD 8' Western. STAYING STOCK
'65 Pontiac Tempest, 406ci chevy small block, TH350 with shift kit, 2700 stall converter.
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post #8 of 13 Old 02-14-2007, 07:39 PM
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6.9's are not Strokers, but they are still kin.................

if you see a light at the end of the tunnel, it's probably just a photon torpedo
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post #9 of 13 Old 07-01-2007, 01:24 AM
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Early 6.9's from 83 to 85 (there is a vin # cutoff) were known to crack blocks in the block-heater area if it was used extensively. Some of the earlier 6.9's had head gasket problems as well. And the glow plug controller in trucks through 86 would fail in the "on" position, burning out all of the glow plugs(don't ask me how I found this out!!)

These IDI's aren't powerhouses, but they tend to be reliable, inexpensive to work on(for a diesel), and return reasonable fuel economy numbers when compared to gas trucks of the same era.....plus they just sound cool!!

Smokey- 1989 Ford F-250 XLT Lariat Regular Cab 4X4 1984 N/A 6.9L with ARP studs,Rebuilt heads, Head and upper end gaskets,Rebuilt IP(2nd rebuild in 4 months), Holley Red Electric Pump, New injectors, Walker BTM with 3" exhaust system, Rebuilt T19,Resealed 1356, 4:10s, 33x12.5x16.5 All terrains, Autometer Gauges,clean interior with new vinyl upholstery, herculined-floor, Pioneer cd player and Sony speakers, good exterior with the exception of the crappy Ford auto-peel hood paint
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post #10 of 13 Old 07-01-2007, 01:26 AM
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And Hi everybody! I'm glad I found this forum. Looks like a wealth of info about Powerstrokes (which I have no clue about) as well as IDI's.

Smokey- 1989 Ford F-250 XLT Lariat Regular Cab 4X4 1984 N/A 6.9L with ARP studs,Rebuilt heads, Head and upper end gaskets,Rebuilt IP(2nd rebuild in 4 months), Holley Red Electric Pump, New injectors, Walker BTM with 3" exhaust system, Rebuilt T19,Resealed 1356, 4:10s, 33x12.5x16.5 All terrains, Autometer Gauges,clean interior with new vinyl upholstery, herculined-floor, Pioneer cd player and Sony speakers, good exterior with the exception of the crappy Ford auto-peel hood paint
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