Last post on Nov 27, 2013 at 1:06 PM
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Apr 05, 2003 (11:36 am)
I doubt you'll ever see that happen. A diesel engine needs to be undersquare due to the way diesel combustion works. low rpm, needs a long stroke to make torque, large bores are useful at high rpm which diesels never reach.
whereas due to its horizontally opposed layout, the boxer engine has a very short stroke and uses significantly oversquare bores to get maximum useable displacement out of a given engine size.
look around at the bore & stroke specifications on some car sites (here on edmunds or perhaps try autos.msn.com) and see for yourself.
if there's ever a diesel powered Subaru, it probably won't be a horizontally opposed engine. as an oil company employee, I think it's best if I avoid going into a spiel about vegetable diesel. I bet you could double your mileage as it is if you replaced your 1900cc carbureted four with a 1.8L SOHC 16V EJ engine, say 1995 Impreza vintage, and used the right gear ratios.
Apr 05, 2003 (12:03 pm)
Doug -- Interesting theory, but the dealer was the last to fill the tranny oil and I'm pretty sure it was what Subaru specifies.
Colin -- Thanks for the links. I am suspecting the same as well. When I had the first gear popping out problem, the dealer said it had to do with the fork being biased a certain way. Perhaps they over corrected and now it tries to stay in first.
So, when I bring my vehicle in I probably should indicate the details of how I pull into my garage. It sounds like if one shifted to a different gear before starting, one may not be able to replicate the problem.
Apr 05, 2003 (1:38 pm)
Susan's Legacy makes a thumping noise from the front driver's side tire. I took a look at the tire itself and didn't see any wear strips, bubbles etc...the car has approx 15,000 miles. Any ideas?
Apr 05, 2003 (2:53 pm)
There may be a nail/screw or its like embedded between the threads in the sip (sp).
I had a tire doing the thumps but could not find anything at first. Removed the tire and went through it thread block by thread block until I found a screw embedded and hidden as described.
Apr 05, 2003 (8:44 pm)
I am with you on your theory, but what bugs me is when Ken said:
"- Normal procedure: E-brake up, in neutral, clutch in, turn key, wait for pump to prime, start engine, clutch out
- Revs rise to 1500RPM
- Seconds later, revs begin to drop to around 1000RPM, engine labors as if clutch is engaging (I'm in neutral!)
- Car jerks forward and stalls, thanks to the e-brake!"
From this, I gather that he lets the clutch fully out and nothing happens as would be normal since he's in neutral. THEN, the engine begins to labor and it feels like the clutch is beginning to engage, the car lurches and the stall happens. To me, if there's a forward gear engaged (even if it's the dog gear only) the engine would immediately labor and stall before the clutch is out because there's a direct connection on a manual - no tranny slippage like an auto torque converter. And if it's partly engaged, you'd get instant grinding.
So, I cannot see how the clutch is let out uneventfully, and THEN a progressive amount of engine load is somehow transmitted here.
So, I'll kinda disagree that your scenario could be possible, but frankly I have no plausible theory myself as to how this can happen on a manual. Very strange.
Apr 06, 2003 (5:54 pm)
clutch out, he's spinning the layshaft at full engine speed. the only possible way to lurch forward is for a gear to slide into engagement.
regarding the earlier comment about synchros... yes that's how they work. I might suspect the synchros are blown on whatever gear is responsible, the first gear synchro sucked previous to 1999 anyway.
ken if you want to avoid this behavior before you get back into the shop, I would suggest engaging 2nd gear then neutral. I bet you pull into your garage or parking stall in 1st gear, nearly everyone does.
Apr 06, 2003 (7:19 pm)
Yes, I do crawl into my garage in 1st and then flick it into neutral before I pull the ebrake and shut off the engine. I see from the link Colin posted that by going to 2nd, that would bias the fork the other way and possibly prevent the problem.
In either way, I'll let you know what the dealer finds.
Colin -- what changes were there to the 1st gear synchro in '99?
Apr 06, 2003 (8:17 pm)
'99 up is definitely double synchro but I'm not sure if '98 had only one or just had a problem.
I am sure that it was far harder for '98 2.5RS and Foresters could not get back down into first gear while moving, whereas the 1999 models could do so easily. they also altered the linkage at the same time, less rubbery and shorter travel.
Apr 06, 2003 (8:24 pm)
thanks for info - steve-v
Apr 07, 2003 (7:03 am)
The '98 had the problem that I alluded to above. Check out NHTSA, I found complaints about the 2.5 RS tranny, and it was the 1-2 synchro.
Here, I found two:
Service Bulletin Number: 034899
VEHICLES EQUIPPED WITH MANUAL TRANSMISSIONS MAY EXHIBIT FIRST GEAR POPPING OUT WHILE DRIVING. *TT
Service Bulletin Number: 17
SUBJECT REGARDING SHIFTER RATTLE. *JG