Honda Prelude 1993 Service Manual page 529

NOTES
A .
See flushinq procedure, Daqe 1+142snd 143.
R
Sst idle rpm in gear to specitied idle speed. lf stillno good, adjust rnotor mounta as outlinsd in engine section
ol service manuel.
lf th€ l8roe clutch oiston O-rino is broken, insoact the Diston qroove for rouqh machininq.
D, It the cfutch psck is seized or is exceasively worn, inspect the oth€r clutchgs tor wear, and chsck th6 orifice
controlvefues and throttle valves for free movem€nt.
lf throttle valve B is stuck. insoect the clutches for wear.
lf the I - 2 shift v8lve is stuck closed, th6 transmission will not upshift. lf stuck open, the transmission has no
l s t o a e r .
th€ 2nd orifice controlvalve is stuck, insDect the 2nd and 3rd clutch oscks tor wear.
th€ oaifice control valve is stuck. insDect tho 3rd 8nd 4th clutch Dscks for wear.
the clutch oressure controlvalve is stuck closed. th€ trsnsmission will not shift out of lst qe8r.
K.
lmpropor alignment or main vav€ body snd torqus conv€rt€r ho$ing may causo oil pump seizure. The
svmbtoms er6 mostlv en rom-rdletgd tickino noise or d hioh-Ditchod sdueek-
tf the ATF strainer is clog€ed with particles ol steelor aluminum, inspoct the oil pump 8nd diff6rential pinion
sheft- lf both 616 OK snd no caus6lor the conteminetion is {ound. roolece the tordua convertor.
M.
lf th€ lst clutch feedpipe guide in the right sida cover i8 scorod by the secondary shaft, insp€ct tho ball
be8ring lor €xc6ssiv6 mov6m6nt in tho transmission housing, lf OK, roplaco th6 right sid6 cov6r as it is dsntad.
Th€ O-rino und€r tho ouide is Drobablv wo.n.
N .
Replaco the mainshaft iJ the bushing for th€ 4th feedpipe is loose or dsmag€d.
lf th6 4th {eedpipe is dsmsged or out of round, roplacs it.
Bsplsce th€ countershaft if the bushing for the 1st-hoH fgedpipe is looss or dsmsged.
lf th€ 1si-hoH feedpipe is damaged or out of round, replac€ h.
Rsplace the secondary shaft it the bushing for the 1st feodpipe is loose or damgod.
lf the 1st f66doiDe is damaodd or out of round. rsDlacs h.
o.
A worn or damagad sprag clutch is mostly a result oJ shitting the transmission in "D3" or "D4" posrtion while
the wheels rotato in aoverse. such as rockino the caa in snow.
nsDect the frame tor collision damase.
Inspect lor damage or wear:
1 . Reverse selector gear teeth chamfers,
2. Engsgement teeth chamfers of countershatt 4th snd revsrse g€ar,
3. Shift fork for scuff marks in center.
4. Differential pinion shatt lor wear under pinion gears.
5. Bottom of 1st-hold clutch for swirlmsrks.
Replace items 1, 2, 3 and 4 it worn or damaged. lf transmission mskes clicking, grinding or whirring noise, also
replace msinshaft 4th gear and reverse idler gear and countershsft 4th gear in addition to 1, 2, 3 or 4,
lf differential pinion shaft is worn, overhaul differential €ssembly, and replsce ATF strain6r, and thoroughly
clean transmission, flush torque convartsr, cooler and lines.
lf bottom oJ 1st-hold clutch is swirled and transmission makes gear noise, replace th€ countershaft and tinal
driven oeer-
R . 86 very careful not to damage the torque converter housing when replaclng th€ main bsll besring. You may
also damage the oil pump when you torque down the main valve body. This will resuh in oil pump seizure if
not detected. [Jse orooer tools.
s.
Installthe main s6alflush with the torque converter housing. lf you push it into the torqus converter housing
until it bottoms out. h willblock the oil return Dassaoe and resuft in damaoe.
r.
Harsh downshifts when coasting to a stop with zero throttle may be cauaed by a bent-in throttlo valve
retainer/cam stooDer. Throttle cable sdiustment mav clear this Drobl€m.
U.
Check if servo vatue stopper cap is installed. lf it was not installod, th€ check vave may have been pushed
out bv hvdraulic oressure causino a leak (internal) atfectinq sllforward qears.
Throttle cable adjustment is essential for proper operation of the transmission. Not only does it sffect the
shift points if misadjusted, but also the shift quality and lock-up clutch operation.
A cable adjusted too long will resuh in th.ottle pressure b6ing too low for th6 amount of engine torque input
into the trsnsmission and m8y cause clutch slippage. A cable sdjusted too short will resutt in too high throttle
oressure which mav cause harsh shitts, erratic shitts and torque conveter hunting,
14-67